JP2009119488A - Joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining method capable of enhancing the watertightness and airtightness between side surfaces of joined metal members by butting a side surface of a first metal member to an end face of a second metal member, and enhancing the joining strength. <P>SOLUTION: The joining method includes a butting step of forming a joined metal member 1 in which a first metal member 1a having a projecting part on its side surface and a second metal member 1b having a recess part on its end face, a first permanent joining step of performing the friction stir welding from a surface A to a butted part J1, a second permanent joining step of performing the friction stir welding from a back side B to the butted part J1, and a side surface permanent joining step of performing at least either one of the welding and the friction stir welding from the side surface to the butted part J1. A surface side plasticized area W1 overlaps a weld metal T1 or a first side surface side plasticized area W3; and a back surface side plasticized area W2 overlaps the weld metal T1 or the first side surface side plasticized area W3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for joining metal members using friction stirring.

  Friction stir welding (FSW = Friction Stir Welding) is known as a method for joining metal members. In friction stir welding, the rotated rotating tool is moved along the abutting portion between the metal members, and the metal at the abutting portion is plastically flowed by the frictional heat between the rotating tool and the metal member, so that the metal members are solid-phased. It is what is joined. In general, the rotating tool is formed by protruding a stirring pin (probe) on the lower end surface of a cylindrical shoulder portion.

By the way, when friction stir welding is performed on a metal member to be joined that has a L-shape in plan view by abutting the side surface of one metal member and the end surface of the other metal member, the front side and the back side of the metal member to be joined In some cases, friction stirring is performed on the corners formed by the side surfaces of both metal members.
However, when friction stirring is performed on the corners with the rotary tool described above, the shoulder portion of the rotary tool comes into contact with one metal member and the other metal member, and therefore the rotary tool cannot be pushed deep. There was a problem.

Then, the invention which concerns on patent document 1 is known as a joining method of the to-be-joined metal member of planar view L shape.
As shown in FIG. 18, in the conventional joining method, friction stir is applied to the abutting portion J1 formed by abutting the side surface of the first metal member 1a and the end surface of the second metal member 1b from the front surface side and the back surface side. Do. And the frictional stirring is performed using the small rotation tool H with respect to the entering corner E formed at a substantially right angle by the side surface of the first metal member 1a and the side surface of the second metal member 1b. That is, the contact member L having a triangular prism shape is brought into contact with the corner E of the metal member 1 to be joined, and the rod-shaped rotary tool H is passed through the upper surface of the contact member L, and the friction is performed while sliding the contact member L. Stir. According to this, even if it is the entrance corner E, it can join suitably and can improve the watertightness and airtightness between the side surfaces of the to-be-joined metal member 1. FIG.

JP-A-11-320128 (see FIG. 2)

  However, when joining the entering corner E of the metal member 1 to be joined, it is difficult to press the stirring pin of the rotary tool H, so the diameter of the stirring pin has to be reduced. For this reason, there is a problem that the bonding strength between the first metal member 1a and the second metal member 1b is low.

  From such a point of view, the present invention improves the water tightness and air tightness between the side surfaces of the metal member to be joined formed by abutting the side surface of the first metal member and the end surface of the second metal member, and increases the bonding strength. It is an object to provide a bonding method that can be enhanced.

  A joining method according to the present invention that solves such a problem includes a first metal member having a convex portion on a side surface and a second metal member having a concave portion on an end surface, butted on the side surface and the end surface. A joining step of forming a joined metal member formed by fitting the portion and the recessed portion, and friction agitation from the surface of the joined metal member to the joined portion of the first metal member and the second metal member A first main joining step, a second main joining step in which friction agitation is performed from the back surface of the metal member to be joined to the abutting portion, and welding and friction agitation from the side surface of the metal member to be joined to the abutting portion. A surface side plasticizing region formed in the first main joining step, a weld metal formed by the welding, or a side surface formed by the friction stirrer. When the side plasticization region overlaps In addition, the back side plasticization region formed in the second main joining step and the weld metal formed by the welding or the side side plasticization region formed by the friction stirrer are overlapped. .

  According to such a joining method, since the abutting portion exposed to the side surface of the metal member to be joined is sealed by at least one of welding and friction stirring, water tightness and air tightness can be improved. In addition, a part of the abutting portion exposed on the side surface of the metal member to be joined is formed at a position separated from the corner by the convex portion of the first metal member and the concave portion of the second metal member. Accordingly, when the abutting portion is frictionally stirred, the stirring pin can be pressed substantially perpendicularly to the joint surface, and thus the stirring pin can be pushed to a deep position. Therefore, the joining strength of the metal member to be joined can be increased. Further, when only welding is performed on the abutting portion exposed on the side surface of the metal member to be bonded, the welding length can be secured longer than before, so that the bonding strength of the metal member to be bonded can be increased. . In addition, since a part of the abutting part is formed at a position separated from the corner, welding and friction agitation work for the abutting part can be performed relatively easily.

  Moreover, it is preferable that at least any one of the said surface side plasticization area | region and the said back surface side plasticization area | region contacts the said convex part. According to this joining method, the abutting portion exposed on the side surface of the metal member to be joined can be more reliably sealed.

  Further, the convex portion according to the present invention may be tapered as it goes away from the first metal member, and the concave portion may be tapered as it goes away from the end surface of the second metal member. preferable. According to this joining method, the first metal member and the second metal member can be smoothly fitted together in the abutting step.

  Further, the present invention provides a groove forming step of forming a groove in advance along the abutting portion exposed on the side surface of the metal member to be bonded before the side surface main bonding step, and the weld metal in the groove. It is preferable to include a welding metal filling step of filling the weld metal.

  According to this joining method, since the concave groove is formed and the weld metal is filled, the workability of welding can be improved.

  Moreover, it is preferable that this invention includes the cutting process which cuts out the weld metal which protruded from the side surface of the said to-be-joined metal member by the said weld metal filling process. According to this joining method, the side surfaces of the metal members to be joined can be formed smoothly.

  Further, according to the present invention, in the entering corner portion of the metal member to be bonded formed by one side surface of the first metal member and one side surface of the second metal member, the exposed metal portion is exposed to the entering corner portion. It is preferable that at least one of the front side plasticization region and the back side plasticization region includes a corner repair process in which friction stirring is performed using a rotating tool.

  According to such a joining method, even if a cavity defect or an oxide film or the like is generated in the surface side plasticized region and the back side plasticized region exposed on the side surface of the metal member to be joined, it is preferable to enclose these voids. Can be repaired.

  According to the joining method according to the present invention, the water tightness and air tightness between the side faces of the metal member to be joined formed by abutting the side face of the first metal member and the end face of the second metal member are improved, and the joining strength is increased. Can be increased.

[First embodiment]
The best embodiment of the present invention will be described with reference to the drawings as appropriate. FIG. 1 is a perspective view showing a joining method according to the first embodiment. As shown in FIG. 1, the joining method according to the first embodiment is such that the side surface of the first metal member 1 a and the end surface of the second metal member 1 b are abutted to form an L shape in plan view, and the front surface A and the back surface While friction stirring is performed from B, both welding and friction stirring are performed on the side surface. First, the metal member 1 to be joined, the tab material, and the rotating tool will be described in detail. In addition, up, down, left, and right before and after in the description follow the arrows in FIG.

  As shown in FIGS. 2A and 2B, the metal member 1 to be bonded is substantially composed of a first metal member 1a having a convex portion N on a side surface and a second metal member 1b having a concave portion O on an end surface. It is formed by fitting with no gap. The first metal member 1a and the second metal member 1b are made of a friction-stirring metal material such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy. Although there is no restriction | limiting in particular in the shape and dimension of the 1st metal member 1a and the 2nd metal member 1b, It is desirable to make the thickness dimension in the abutting part J1 the same at least.

  The first metal member 1a has a rectangular parallelepiped shape in cross section, and has a convex portion N having a trapezoidal shape in a cross section projecting from the side surface 14a. The convex portion N extends from the end surface 11a of the first metal member 1a in the front-rear axis direction. The convex portion N is formed at the center in the height direction of the side surface 14a of the first metal member 1a. The length of the long side according to the trapezoid of the convex portion N is p1, and the length of the short side is p2. Further, the protruding height from the long side to the short side is p3, and the length of the convex portion N is p4.

In the present embodiment, the protrusion height p3 is formed to be larger than the radius of the shoulder portion G1 of the large-sized joining rotary tool G (see FIG. 3B) described later. That is, the protruding height p3, the relationship between the outer diameter Y ₁ of the shoulder portion G1 of the later-described large joining rotation tool G, and is formed such that p3> Y _1/2.

  The second metal member 1b has a rectangular parallelepiped shape in cross section, and has a recess O in the shape of an isosceles trapezoid in a cross section provided in the end surface 11b. The recess O is formed continuously from one side surface 14b of the second metal member 1b to the other side surface 15b. The recess O is formed at the center in the height direction of the end surface 11b of the second metal member 1b. The length of the long side relating to the cross section of the recess O is q1, and the length of the short side is q2. The depth from the long side to the short side is q3, and the length of the recess O is q4.

  As shown in FIG. 2 (b), when the convex portion N of the first metal member 1a and the concave portion O of the second metal member 1b are abutted with each other, they are fitted so that there is almost no gap between them. Part J1 is formed. That is, the cross-sectional shapes of the convex portion N and the concave portion O are substantially equal (p1≈q1, p2≈q2, p3≈q3, p4≈q4). In addition, the shape of the convex part N and the recessed part O is not limited to a trapezoidal shape such as a cross-sectional view, and may be another shape.

  Moreover, the convex part N is formed so that it may taper (taper) as it goes to the direction spaced apart from the side surface 14a. Moreover, the recessed part O is formed so that it may taper off as it goes to the direction spaced apart from the end surface 11b. Thereby, the operation | work which fits the 1st metal member 1a and the 2nd metal member 1b becomes easy.

As shown in FIG. 2B, the surface formed by the surface 12 a of the first metal member 1 a and the surface 12 b of the second metal member 1 b in the metal member 1 to be bonded is also referred to as a surface A. A surface formed by the back surface 13a of the first metal member 1a and the back surface 13b of the second metal member 1b is also referred to as a back surface B.
Moreover, the surface formed by the side surface 14a of the 1st metal member 1a and the side surface 14b of the 2nd metal member 1b among the to-be-joined metal members 1 is also called 1st side surface C. A surface formed by the end surface 11a of the first metal member 1a and the side surface 15b of the second metal member 1b is also referred to as a second side surface D. Further, a corner portion formed substantially perpendicular to the side surface 14a of the first metal member 1a and the side surface 14b of the second metal member 1b is defined as a corner portion I.

  Next, referring to FIG. 3, a rotary tool F used for temporary joining or the like (hereinafter referred to as “small joining rotary tool F”) and a rotary tool G used for main joining (hereinafter referred to as “large joining rotary tool G”). Will be described in detail.

  The small joining rotary tool F shown in FIG. 3 (a) is made of a metal material harder than the metal member 1 to be joined, such as tool steel, and has a cylindrical shoulder portion F1 and a lower end face F11 of the shoulder portion F1. And an agitating pin (probe) F2 provided in a protruding manner. The size and shape of the small joining rotary tool F may be set according to the material, thickness, etc. of the metal member 1 to be joined, but at least the large joining rotary tool G used in the first main joining step described later ( (See (b) of FIG. 3). This makes it possible to perform temporary bonding with a load smaller than that of the main bonding, so that it is possible to reduce the load applied to the friction stirrer at the time of temporary bonding. Since the moving speed (feeding speed) can be made higher than the moving speed of the large-sized joining rotary tool G, the working time and cost required for temporary joining can be reduced.

The lower end surface F11 of the shoulder portion F1 is a portion that plays a role of pressing the plastic fluidized metal and preventing scattering to the surroundings, and is formed in a concave shape in this embodiment. Not particularly limited to the size of the outer diameter X ₁ of the shoulder portion F1, but in the present embodiment, is smaller than the outer diameter Y ₁ of the shoulder portion G1 of the rotary tool G for large junction.

The stirring pin F2 hangs down from the center of the lower end surface F11 of the shoulder portion F1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin F2. There is no particular limitation on the size of the outer diameter of the stirring pin F2, in the present embodiment, the maximum outer diameter (upper diameter) X ₂ is the maximum outer diameter of the stirring pin G2 of the rotary tool G for large joint (upper end diameter) Y ₂ smaller than, and the minimum outer diameter (bottom diameter) _{X 3} is smaller than the minimum outer diameter (bottom diameter) _{Y 3} of the stirring pin G2. It is desirable that the length L _A of the stirring pin F2 be smaller than the length L ₁ of the stirring pin G2 of the large joining rotary tool G.

  The large-sized joining rotary tool G shown in FIG. 3B is made of a metal material harder than the metal member 1 to be joined, such as tool steel, and has a cylindrical shoulder portion G1 and a lower end face G11 of the shoulder portion G1. And an agitating pin (probe) G2 provided in a protruding manner.

  The lower end surface G11 of the shoulder portion G1 is formed in a concave shape like the small joining rotary tool F. The stirring pin G2 hangs down from the center of the lower end surface G11 of the shoulder portion G1, and is formed into a tapered truncated cone shape in this embodiment. In addition, a stirring blade engraved in a spiral shape is formed on the peripheral surface of the stirring pin G2.

  As shown in FIG. 4, the first tab member 2 and the second tab member 3 are arranged so as to sandwich the abutting portion J1 of the metal member 1 to be bonded. It covers the seams (boundary lines) that appear on both sides. Although there is no restriction | limiting in particular in the material of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, it forms with the metal material of the same composition as the to-be-joined metal member 1. FIG. Moreover, there is no restriction | limiting in particular also in the shape and dimension of the 1st tab material 2 and the 2nd tab material 3, In this embodiment, the thickness dimension is the same as the thickness dimension of the to-be-joined metal member 1 in the butt | matching part J1. I have to.

  Hereinafter, each process according to the present embodiment will be described in detail. The bonding method according to this embodiment includes (1) a butt process, (2) a first temporary bonding process, (3) a first main bonding process, (4) a second temporary bonding process, and (5) a second main bonding process. (6) 1st side surface main joining process and (7) 2nd side surface main joining process are included.

(1) Butting process The butting process includes a butting process in which the first metal member 1a and the second metal member 1b are butted to form the metal member 1 to be joined, and a tab material arrangement in which the tab material is arranged on the metal member 1 to be joined. Process.
In the abutting step, as shown in FIGS. 2A and 2B, the side surface 14a of the first metal member 1a and the end surface 11b of the second metal member 1b are abutted to form the bonded metal member 1. That is, the convex portion N of the first metal member 1a and the concave portion O of the second metal member 1b are fitted together. In the bonded metal member 1, the surface 12a of the first metal member 1a and the surface 12b of the second metal member 1b are formed flush with each other, and the back surface 13a of the first metal member 1a and the back surface of the second metal member 1b. It is formed flush with 13b. The one side surface 14a of the first metal member 1a and the one side surface 14b of the second metal member 1b are formed substantially perpendicularly. The end surface 11a of the first metal member 1a and the other side surface 15b of the second metal member 1b are formed flush with each other.

  Here, as shown in FIG. 2B, the abutting surface between the convex portion N and the concave portion O of the abutting portion J1 between the first metal member 1a and the second metal member 1b is defined as a mating portion J10. Further, in the abutting portion J10, a vertical portion is defined as a vertical side portion J10a, one hypotenuse portion as a hypotenuse portion 10b, and the other hypotenuse portion as a hypotenuse portion 10c.

  In the tab material arranging step, as shown in FIG. 4, the first tab material 2 and the second tab material 3 are arranged on the second side face D of the metal member 1 to be joined and the corner I of the metal member 1 to be joined, respectively. . The 1st tab material 2 and the 2nd tab material 3 consist of a material equivalent to the to-be-joined metal member 1 in this embodiment. The first tab member 2 has a rectangular parallelepiped shape, and is disposed in contact with the second side face D of the metal member 1 to be joined along the abutting portion J1. The front surface and the back surface of the first tab member 2 are formed flush with the front surface A and the back surface B of the bonded metal member 1, respectively. The corners 2a and 2b between the first tab member 2 and the metal member 1 to be joined are temporarily joined by welding. Thereby, the opening at the time of performing friction stirring can be prevented. In addition, let the abutting part of the 1st tab material 2 and the to-be-joined metal member 1 be the abutting part j2.

The second tab member 3 has a rectangular parallelepiped shape, and is placed in contact with the first metal member 1a and the second metal member 1b at the corner I. The front surface and the back surface of the second tab material 3 are formed flush with the front surface A and the back surface B of the bonded metal member 1, respectively. Further, the corners 3 a and 3 b between the second tab member 3 and the metal member 1 to be joined are temporarily joined by welding similarly to the first tab member 2.
When the tab material is arranged on the metal member 1 to be bonded, the metal member 1 to be bonded is fixed to a friction stirrer (not shown) with a jig or the like so that the surface A faces upward.

(2) First Temporary Bonding Step The first temporary bonding step includes a first temporary bonding step of temporarily bonding the metal member 1 to be bonded and the tab material from the surface A of the metal member 1 to be bonded, and a first main bonding described later. And a pilot hole forming step of forming a pilot hole at the starting position of friction stirring in the process.

  In the first temporary joining step, as shown in FIG. 5, the small joining rotary tool F is moved from the surface A of the metal member 1 to be joined so as to form a one-stroke movement trajectory (bead). Friction stirring is continuously performed on j2, J1, j3, and j4. That is, the first temporary joining step includes a first tab material joining step for joining the abutting portion j2, a temporary joining step for joining the abutting portion J1, and a second tab material joining step for joining the abutting portions j3 and j4.

The procedure of friction stirring in the first temporary joining step of this embodiment will be described in more detail.
First, by inserting the starting position S _P1 provided in place of the first tab member 2 while the right rotating the stirring pins F2 for small joint rotation tool F starts friction stir, the rotary tool F for small joint first Relative movement is made toward the starting point s2 of the tab material joining step.

  When the small tool rotating tool F is relatively moved and friction stirring is continuously performed up to the starting point s2 of the first tab material joining step, the first tab material joining is performed without removing the small tool rotating tool F at the starting point s2. Move to the process.

  In the first tab material joining step, friction agitation is performed on the abutting portion j2 between the first tab material 2 and the metal member 1 to be joined. Specifically, a route for friction stirring is set on the joint between the metal member 1 to be joined and the first tab member 2, and the small joining rotary tool F is relatively moved along the route, so that the abutting portion j2 Friction agitation is performed. In the present embodiment, the friction stir is continuously performed from the start point s2 to the end point e2 of the first tab material joining step without causing the small joining rotary tool F to be detached on the way.

  When the small joining rotary tool F is rotated to the right, there is a possibility that a fine joining defect may occur on the left side in the traveling direction. Therefore, the first tab member is located on the left side in the traveling direction of the small joining rotary tool F. It is desirable to set the positions of the start point s2 and the end point e2 of the first tab material joining step so that 2 is located. If it does in this way, since it becomes difficult to generate | occur | produce a joining defect on the to-be-joined metal member 1 side, it becomes possible to obtain a high quality product.

  When the small joining rotary tool F reaches the end point e2 of the first tab material joining step, the friction stir is continuously performed to the start point s1 of the temporary joining step without terminating the friction stirring at the end point e2, and the temporary joining step is performed as it is. Transition. In the present embodiment, the friction stir route from the end point e2 of the first tab material joining process to the start point s1 of the temporary joining process is set to the first tab material 2.

  In the temporary joining step, friction agitation is performed on the abutting portion J1 of the metal member 1 to be joined. Specifically, a friction stir route is set on the joint of the metal member 1 to be joined, and the small joining rotary tool F is relatively moved along the route, whereby the stir portion J1 is friction stir. . In the present embodiment, the friction stir is continuously performed from the start point s1 to the end point e1 of the temporary joining step without causing the small joining rotary tool F to be detached in the middle.

  When the small joining rotary tool F reaches the end point e1 of the temporary joining process, the process proceeds to the second tab material joining process as it is. That is, the process proceeds to the second tab material joining step without detaching the small joining rotary tool F at the end point e1 of the temporary joining step which is also the starting point s3 of the second tab material joining step.

  In the second tab material joining step, friction agitation is performed on the abutting portion j3 between the metal member 1 to be joined and the second tab material 3. In the present embodiment, a turning point m3 is provided on the abutting portion j3, and the small joining rotating tool F is moved from the starting point s3 to the turning point m3, and then the small joining rotating tool F is moved from the turning point m3 to the end point e3. By doing so, the friction stir is continuously performed from the start point s3 to the end point e3 of the second tab material joining step. That is, after the small joining rotary tool F is reciprocated between the start point s3 and the turning point m3, the small joining rotary tool F is moved from the end point e3 to the second tab material joining step from the start point s3 to the end point e3. Friction stirring is performed continuously. The route of friction stirring from the start point s3 to the turning point m3 and the route of friction stirring from the turning point m3 to the end point e3 are set on the joint between the metal member 1 to be joined and the second tab member 3, respectively.

As shown in FIG. 5, when the small joining rotary tool F reaches the end point e3 of the second tab material joining step, the end position E _P1 provided on the second tab material 3 without terminating the friction stirring at the end point e3. Friction stirring is performed continuously until. When the small joining rotary tool F reaches the end position E _P1 , the small joining rotary tool F is raised while rotating and separated from the end position E _P1 .

In the pilot hole forming step, as shown in FIG. 3B, the pilot hole P1 is formed at the planned insertion position (starting position) where the large-sized bonding rotary tool G is inserted in the first main bonding step. . In the pilot hole forming process according to the present embodiment, the pilot hole P1 is formed at the end position E _P1 (see FIG. 5) of the first temporary bonding process. Since the punch hole of the rotary tool F for small joining is formed at the end position E _P1 , the pilot hole P1 can be easily formed using the punch hole.

  There is no limitation on the position of the pilot hole P1 (that is, the friction stirring start position in the first main joining step), and it may be formed on the first tab material 2 or the second tab material 3 or formed on the abutting portion j2. However, it is desirable to form on the extension line of the abutting part J1 of the metal member 1 to be joined as in this embodiment.

(3) 1st main joining process A 1st main joining process is a process of performing frictional stirring in earnest from the surface A of the to-be-joined metal member 1 with respect to the abutting part J1, as shown in FIG. In the first main joining step according to the present embodiment, the surface A of the metal member 1 to be joined is used with respect to the abutting portion J1 in a temporarily joined state using the large joining rotary tool G shown in FIG. Friction stir.

In the first one bonding step, first, as shown in FIG. 6, insert the rotary tool G for large joining the prepared hole P1 formed a stirring pin G2 at the start position S _M1 while counterclockwise rotation, starting friction stir To do. In the present embodiment, since the start position S _M1 provided in the butting portion j4 between the joined metal member 1 and the second tab member 3, when press-fitting the stirring pin G2 of the rotary tool G for large bonding, plastic flow Since part of the converted metal flows into a fine gap between the metal member 1 to be joined and the second tab member 3, and then the dissipation of the plastic fluidized metal into the gap is reduced, Bonding defects due to lack of meat are less likely to occur.

  In addition, when the stirring pin G2 of the large-sized joining rotary tool G is press-fitted into the prepared hole P1, a force for separating the joined metal member 1 and the second tab material 3 acts, but the joined metal member 1 and the second Since the corners 3 a, 3 a formed by the tab material 3 are temporarily joined by welding, no openings are generated between the metal member 1 to be joined and the second tab material 3.

After frictional stirring is performed up to one end of the abutting portion J1 of the metal member 1 to be joined, the large-sized rotating tool G is rushed into the abutting portion J1, and the friction stirring route set on the joint of the metal member 1 to be joined is entered. The friction stir is continuously performed from one end to the other end of the abutting portion J1 by relatively moving the large joining rotary tool G along the end. When the large joining rotary tool G is relatively moved to the other end of the abutting portion J1, the abutting portion j2 is traversed while performing frictional stirring, and is relatively moved toward the end position E _M1 as it is.

When the large-sized joining rotary tool G reaches the end position E _M1 , the large-sized joining rotary tool G is raised while rotating, and the stirring pin G2 is detached from the end position E _M1 . On the surface A of the metal member 1 to be joined, a surface side plasticized region W1 is formed along the abutting portion J1.
In the present embodiment has exemplified a case in which the start position S _M1 of the friction stir in the single joining step butting portion j4, it may be provided on the first tab member 2, the second tab member 3 may be provided. Moreover, when the first main bonding step is completed, it is preferable to remove the burrs formed on the surface A to form the surface A smoothly. Thereby, when arrange | positioning a tab material on the surface A in the tab material arrangement | positioning process mentioned later, a tab material and the to-be-joined metal member 1 can be stuck.
When the first main joining step is completed, the metal member 1 to be joined is once removed from a friction stirrer (not shown), and fixed again with a jig so that the back surface B faces upward.

(4) Second Temporary Bonding Step FIG. 7 is a plan view showing a second temporary bonding step and a second main bonding step according to the first embodiment. As shown in FIG. 7, the second temporary bonding step includes a second temporary bonding step of temporarily bonding the metal member 1 to be bonded and the tab material from the back surface B of the metal member 1 to be bonded, and friction in the second main bonding step. And a pilot hole forming step of forming a pilot hole at the starting position of stirring.
In the second temporary joining step, as shown in FIG. 7, the joining metal member 1, the first tab material 2, and the second tab material 3 are rotated counterclockwise from the back surface B of the joining metal member 1. The rotary tool F is moved so as to form a one-stroke writing movement trajectory (bead), and friction stir is continuously performed on the abutting portions j2, J1, j3, and j4. That is, the second temporary joining step includes a first tab material joining step for joining the abutting portion j2, a temporary joining step for joining the abutting portion J1, and a second tab material joining step for joining the abutting portions j3 and j4. In the present embodiment, the start position S _P2 of the second temporary bonding step is set to the first tab member 2, it sets the end position E _P2 on butting portion j4.
Since the second temporary bonding step is substantially the same as the first temporary bonding step described above, detailed description thereof is omitted.

(5) Second Main Joining Process The second main joining process is a process in which frictional stirring is performed in earnest from the back surface B of the metal member 1 to be joined, as shown in FIG. In the second main joining step according to the present embodiment, the large-sized joining rotary tool G shown in FIG. 3B is rotated to the right and used, and the metal member to be joined with respect to the abutting portion J1 in a temporarily joined state. Friction stirring is performed from the back surface B of 1.
In the present embodiment, the second main joining step is performed without detaching the large joining rotary tool G from the start position S _M2 set in the abutting portion j4 to the end position E _M2 set in the first tab member 2. Friction stirring is performed. Since the second main joining step is substantially the same as the first main joining step described above, detailed description thereof is omitted. In addition, the back surface side plasticization area | region W2 is formed in the back surface B of the to-be-joined metal member 1 along the abutting part J1.

When the second main joining step is completed, the first tab material 2 and the second tab material 3 are cut out from the metal member 1 to be joined. FIG. 8 is a diagram showing a first side main joining process according to the first embodiment. As shown in FIG. 8, in the first main joining process, the large-sized joining rotary tool G is rotated counterclockwise to perform frictional stirring, so that it is on the right side in the traveling direction (on the second metal member 1b side of the surface side plasticizing region W1). There is a possibility that a tunnel-like cavity defect R (hereinafter referred to as a tunnel-like cavity defect R) occurs. Further, in the second main joining step, since the large-sized joining rotary tool G is rotated to the right to perform frictional stirring, a tunnel-like cavity defect R is formed on the left side in the traveling direction (on the second metal member 1b side of the back surface plasticizing region W2). May occur.
In addition, the oxide film formed on the abutting portion j4 between the second tab member 3 and the metal member 1 to be bonded is formed inside the metal member 1 (the first metal member) by the first main bonding step and the second main bonding step. 1a side). About these defects, it repairs suitably in the repair process mentioned later.

(6) 1st side surface main joining process A 1st side surface main joining process is exposed to the 1st side surface C (on one side surface 14b of the 2nd metal member 1b) of the to-be-joined metal member 1, as shown in FIG. The abutting portion J10 is sealed by performing at least one of welding and friction stirring on the abutting portion J10. On the other hand, the second side main joining step to be described later is performed on the abutting portion J10 (see FIG. 10) exposed on the second side D of the metal member 1 to be joined (on the other side 15b of the second metal member 1b). The abutting portion J10 is sealed by performing at least one of welding and friction stirring. In the present embodiment, the first side main bonding process and the second side main bonding process are collectively referred to as a side main bonding process.

  In the present embodiment, the first side main joining step is a step of forming a concave groove K along the abutting portion J10 and a step of welding the concave groove K to fill the concave groove K with the weld metal T1. It includes a weld metal filling step, a cutting step of cutting the build-up portion T1 ′ of the weld metal T1, and a first side friction stirring step of performing friction stirring on a part of the abutting portion J10.

  In the concave groove forming step, as shown in FIG. 8, the concave groove K is formed along the abutting portion J10 using a known end mill or the like. Both ends of the groove K are formed so as to overlap the front surface side plasticized region W1 and the back surface side plasticized region W2. Thereby, in the welding metal filling process to be described later, the front side plasticized region W1 and the back side plasticized region W2 and the weld metal T can be overlapped, so that the abutting portion J10 can be sealed without a gap. . In the present embodiment, the shape of the concave groove K is formed in a substantially semicircular shape in cross section as shown in FIG. 8B, but the shape is not limited.

  In the weld metal filling step, overlay welding is performed on the groove K, and the groove K is filled with the weld metal T1. In the overlay welding, for example, TIG welding or MIG welding is performed to such an extent that the weld metal T1 protrudes from the first side face C, as shown in FIG. In addition, let the part which protruded from the 1st side C among weld metal T1 be the build-up part T1 '.

  In the cutting process, the welded portion T1 'protruding from the first side surface C of the weld metal T1 is cut using a known cutting tool. Thereby, the 1st side C can be shape | molded smoothly.

  As shown in FIG. 9, the first side friction stirrer step includes a tab material arrangement step in which a pair of tab members are arranged on the front surface A and the back surface B, and a vertical side portion of the abutting portion J10 exposed on the first side surface C. And a first side frictional stirring step for performing frictional stirring along J10a.

  In the tab material arranging step, as shown in FIG. 9, a pair of third tab material 4 and fourth tab material 5 are arranged along the front surface A and the back surface B of the metal member 1 to be joined. The 3rd tab material 4 and the 4th tab material 5 are arrange | positioned on the extension line | wire of the vertical side part J10a of the abutting part J10. The 3rd tab material 4 and the 4th tab material 5 are formed so that the surface and the back surface may be the same as the 1st side surface C and the 2nd side surface D of the to-be-joined metal member 1, respectively. The corners 4a and 4b between the metal member 1 and the third tab member 4 are temporarily joined by welding. Similarly, the corners 5a and 5b between the metal member 1 and the fourth tab member 5 are temporarily joined by welding.

In the first side frictional stirring step, as shown in FIG. 9, the frictional stirring is performed on the vertical side portion J10a of the abutting portion J10. That is, friction agitation is performed so as to include the abutting portion between the tip surface of the convex portion N and the bottom surface of the concave portion O. In the present embodiment, the start position S _M3 of the first side frictional stirring process is set to the fourth tab member 5, and the end position E _M3 is set to the third tab member 4. The start position S _M3 and the end position E _M4 are set on an extension line of the vertical side portion J10a of the abutting portion J10. Thereby, a 1st side surface friction stirring process can be performed in the shortest distance.

More specifically, the large joining rotary tool G is rotated and pushed into the start position _SM3 set on the fourth tab member 5, and is relatively moved toward the third tab member 4 side. The abutting portion j5 between the fourth tab member 5 and the metal member 1 to be joined is passed through and moved relatively along the vertical side portion J10a without leaving the large joining rotary tool G. Then, a third tab member 4 is passed through the butting portion j6 between the joined metal member 1, disengaging the rotating tool G for a large junction at the end position E _M3 which is set to the third tab member 4. On the first side surface C, a first side surface plasticizing region W3 is formed by the first side surface friction stirring step. In addition, before performing a 1st side surface friction stirring process, you may reduce the press-fit resistance of the rotary tool G for large joining by forming the above-mentioned _pilot hole in start position _SM3 .

  As shown in FIG. 9, the width Wa of the first side surface plasticizing region W <b> 3 is formed larger than the width Ka of the groove K. Thereby, the friction stir of the interface of the ditch | groove K and the weld metal T1 can be carried out over the full length of the vertical side part J10a.

  Here, the distance Na from the surface A to the oblique side portion J10b of the abutting portion J10 is formed to be smaller than the depth W1d of the surface side plasticizing region W1. Similarly, the distance Na from the back surface B to the oblique side portion 10c of the abutting portion J10 is formed to be smaller than the depth W2d of the back surface plasticizing region W2. That is, the abutting portion J10 can be more reliably sealed by overlapping the front surface side plasticized region W1 and the back surface side plasticized region W2 with the convex portion N of the first metal member 1a.

(7) Second side main joining process As shown in FIG. 10, the second side main joining process is performed by either welding or friction stirring on the abutting portion J10 exposed on the second side D of the metal member 1 to be joined. By doing either one, the butt portion J10 is sealed. In this embodiment, the second side main joining step includes a groove forming step for forming the groove K along the abutting portion J10, and welding the groove K to fill the groove K with the weld metal T2. It includes a weld metal filling step, a cutting step for cutting off a built-up portion (not shown) of the weld metal T2, and a second side friction stirring step for performing friction stirring on part of the abutting portion J10.

  In the concave groove forming step, the concave groove K is formed using a known end mill or the like along the abutting portion J10 exposed on the second side face D, as shown in FIG. Both ends of the groove K are formed so as to overlap the front surface side plasticized region W1 and the back surface side plasticized region W2. Thereby, in the welding metal filling process to be described later, the front side plasticized region W1 and the back side plasticized region W2 and the weld metal T2 can be overlapped, so that the abutting portion J10 can be sealed without a gap. .

  In the weld metal filling process, as shown in FIG. 10, build-up welding is performed on the groove K and the groove K is filled with the weld metal T2. In overlay welding, for example, TIG welding or MIG welding is performed to such an extent that the weld metal T2 protrudes from the second side surface D (see FIG. 8B).

  In the excision step, the build-up portion (not shown) protruding from the second side face D of the weld metal T2 is excised using a known cutting tool. Thereby, the 2nd side surface D can be shape | molded smoothly.

In the second side frictional stirring step, as shown in FIG. 11, the frictional stirring is performed along the vertical side portion J10a of the abutting portion J10. That is, friction agitation is performed so as to include the abutting portion between the tip surface of the convex portion N and the bottom surface of the concave portion O. In the present embodiment, the second side frictional stirring step separates the large joining rotary tool G from the start position S _M4 set on the third tab member 4 to the end position E _M4 set on the fourth tab member 5. Without friction, the friction stir is performed continuously. On the second side surface D, a second side surface plasticizing region W4 is formed by the second side main bonding step. Since the second side frictional stirring step is substantially the same as the first side frictional stirring step, detailed description is omitted.

  According to the joining method which concerns on 1st embodiment demonstrated above, while making the surface side plasticization area | region W1 and the back surface side plasticization area | region W2, and the convex part N of the 1st metal member 1a overlap, it is meat in the abutting part J10. By performing prime welding and further performing frictional stirring along the vertical side portion J10a of the abutting portion J10, the abutting portion J10 exposed on the side surface of the metal member 1 to be bonded can be reliably sealed. Thereby, the watertightness and airtightness between the side surfaces of the to-be-joined metal member 1 can be improved.

  Further, the abutting portion J10 exposed on the first side surface C of the metal member 1 to be joined is formed at a position separated from the corner I by the convex portion N of the first metal member 1a and the concave portion O of the second metal member 1b. Is done. Accordingly, when the abutting portion J10 (J10a) is frictionally stirred, the stirring pin G2 of the large-sized joining rotary tool G can be pressed substantially perpendicularly to the joining surface. Can be pushed in. Therefore, since a wide area can be frictionally stirred as compared with the case where the entering corner I is frictionally stirred, the bonding strength of the metal member 1 to be bonded can be increased. Further, since a part of the abutting portion J10 is formed at a position separated from the corner portion I, welding and friction agitation work for the abutting portion J10 can be performed relatively easily.

  Here, as shown in FIG.1 and FIG.9, since the to-be-joined metal member 1 which concerns on this embodiment exhibits planar view L shape, the friction stirring of the butt | joint part J10 exposed to the 1st side C is difficult. There is a case. That is, when friction-stirring the abutting part J10, depending on the structure of a friction stirrer (not shown), the large-sized joining rotary tool G may not be brought closer to the first metal member 1a side due to the engagement of the devices. As a result, an unplasticized region is formed in the abutting portion J10, which causes a decrease in water tightness and air tightness.

  However, in this embodiment, the protrusion height p3 of the convex portion N is formed to be larger than at least the radius of the shoulder portion G1 of the large-sized joining rotary tool G. Thereby, a side surface main joining process can be performed using the rotation tool G for large sized joining.

  In addition, the groove K is formed to fill the weld metals T1 and T2, and the built-up portion T1 ′ is cut off in the cutting process, so that the side surface of the metal member 1 to be joined is smoothed and the finished surface is molded cleanly. can do.

  In the present invention, a product having higher airtightness and watertightness can be formed by appropriately performing a repair process. Hereinafter, the entering corner repair process, the first repair process, the second repair process, and the cross repair process will be described.

(8) Entering corner repairing process In the entering corner repairing process, as shown in FIG. 12, friction stirring is performed on the entering corner I of the metal member 1 to be joined by using the entering corner rotating tool H. Is. In the entering corner repairing process, a contact member L presenting a triangular prism is applied to the entering corner I, a relatively small entering corner rotating tool H is passed through the abutting member L, and the contacting member L is inserted into the entering corner I. Friction agitation is performed while sliding. By performing the friction stir at corners I enters this enters corner plasticized region w _h is formed, potential tunnel to be formed on the surface side plasticized region W1 and the rear surface side plasticized region W2 The cavity defect R and the oxide film (not shown) can be sealed.

(9) 1st repair process, 2nd repair process As shown to (a) and (b) of FIG. 13, the 1st repair process and the 2nd repair process are the surface A of the to-be-joined metal member 1, and the back surface B. In at least one of them, a portion where a defect is formed in the front surface side plasticization region W1 and the back surface plasticization region W2 is repaired by friction stirring.

In the first main joining step according to the present embodiment, the large-sized joining rotary tool G is rotated counterclockwise and relatively moved from the second tab material 3 side toward the first tab material 2 side. A tunnel-like cavity defect may be formed in a region on the right side in the traveling direction inside the side plasticized region W1 (this region is referred to as a first repair region r1).
Moreover, since the oxide film is formed in the butt | matching part j2, when the above-mentioned 1st main joining process is performed, it is the 1st tab material 2 side in the 1st metal member 1a, and 2nd metal member There is a possibility that an oxide film is caught inside the region on the 1b side (this region is referred to as a second repair region r2). For this reason, the first repair process is performed for the first repair area r1, and the second repair process is performed for the second repair area r2 by performing friction stir using the small joining rotary tool F. In the present embodiment, the small joining rotary tool F is used. However, the rotary tool may be appropriately selected depending on the expected size and depth of the defect.

  In the present embodiment, as shown in FIG. 13B, the small joining rotary tool F is moved so as to form a one-stroke writing trajectory (bead), and the first repair process and the second repair process are performed. Do it continuously. In the present embodiment, the case where the friction stirring is performed in the order of the first repair region r1 and the second repair region r2 is illustrated, but the order of the friction stirring is not limited.

The friction stir procedure in the first repair process and the second repair process will be described in more detail with reference to FIG.
First, insert the stirring pin start position S _R to rotate for a small welding tool F which is provided in place of the bonding metal member 1 (press-fit) to the start of friction stir, the first repair region r1 (FIG. 13 (a ))). In the present embodiment, the folded starting position S _M1 of the friction stir in the single bonding step is provided with the starting position S _R in the vicinity _(see FIG. 6), on the side opposite to the end position E _R across the start position S _R the point M _R provided, after moved relative towards the point folding the rotary tool F for small junction M _R, folded at folding points M _R, then, by relative movement along the butting portion J1, the first repair Friction stirring is performed on the region r1.

  When the friction agitation with respect to the first repair region r1 is completed, the small welding rotary tool F is not detached and the process proceeds to the second repair step as it is, and the friction agitation is performed with respect to the second repair region r2. When the second repair region r2 is larger than the region where the friction stir can be performed with the small joining rotary tool F as in the present embodiment, the small joining rotary tool F is changed while shifting the friction stirring route. Just make a U-turn.

When friction stir is finished for the second repair region r2, stirring rotation tool F for small joint is moved to the end position E _R set on the first tab member 2, it is moved upward while rotating the rotating tool F for small joint disengaging the pin from the end position E _R.

(10) First Cross Repair Process FIG. 14 is a plan view on the surface A side of the bonded metal member 1 showing the first repair process and the second repair process. In the first transverse repair process, at least one of the front surface side plasticized region W1 formed on the surface A of the bonded metal member 1 and the rear surface side plasticized region W2 formed on the back surface B is traversed a plurality of times. The small joining rotary tool F is moved.

The friction stir route in the first transverse repair process is adjacent to a plurality of intersecting routes f1, f1,... Crossing the surface plasticization region W1 on the center line of the surface plasticization region W1 in the first main joining process. Transition routes f2, f2,... Connecting the ends on the same side of the routes f1, f1 are provided.
The intersecting route f1 is orthogonal to the friction stirring route in the first main joining step. The transition route f2 is provided on the right side or the left side of the surface side plasticizing region W1, and is parallel to the friction stirring route in the first main joining step.

The procedure of friction stirring in the first transverse repair process will be described in detail.
The first transverse repairing step, continuous rotation tool F for small joint, by moving in a zigzag shape so as to form a one-stroke movement locus (bead), to the end position E _C from the start position S _C of the friction stir And friction stir.

In the first traverse repairing process, firstly, inserting the stirring pin start position S _C to the rotation for small welding tool F which is provided in place of the bonding metal member 1 (press-fit) to the start of friction stir, one-eyed Friction stirring is continuously performed along the intersection route f1. When the end point e10 of the first intersection route f1 is reached, the moving direction of the small joining rotary tool F is changed and moved along the transition route f2, and the metal on the side of the surface side plasticizing region W1 is moved to the metal. On the other hand, friction stirring is continuously performed. When the small joining rotary tool F reaches the start point s10 of the second crossing route f1, the moving direction of the small joining rotary tool F is changed and moved along the second crossing route f1, and the surface side plasticity is changed. Friction stirring is continuously performed on the control region W1. The above-mentioned process is repeated, and when the small joining rotary tool F reaches the end point e10 of the last intersection route f1, the small joining rotary tool F is moved to the end position E _C and the small joining rotary tool F is rotated. The stirring pin is released from the end position E _C by raising the stirring pin. Thus, according to the first transverse repair process, by performing frictional stirring in a direction perpendicular to the longitudinal direction of the front surface side plasticized region W1 or the back surface side plasticized region W2, the bonding strength of the metal member 1 to be bonded is increased. Can be increased.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The second embodiment according to the present invention is different from the first embodiment in that the groove is not formed and the shapes of the convex portion N and the concave portion O are different in the first side main joining step and the second side main joining step. To do. In addition, in the following description, although the 1st side surface main joining process is made into an example, you may carry out by a 2nd side surface main joining process.

  The convex part N1 of the 1st metal member 1a which concerns on 2nd embodiment, and the recessed part O1 of the 2nd metal member 1b exhibit a cross sectional view rectangle. As described above, the shapes of the convex portion N1 and the concave portion O1 may be appropriately set depending on the metal member 1 to be bonded. The abutting portion J11 formed by the convex portion N1 and the concave portion O1 includes a vertical side portion J11a and vertical side portions J11b and J11c extending vertically from both ends of the vertical side portion J11a.

  The first side main joining process according to the second embodiment includes a welding joining process in which welding is performed along the abutting portion J11 and a first side friction agitating process in which friction agitation is performed on a part of the abutting portion J11.

  In the present embodiment, in the present embodiment, welding is performed over the entire length of the vertical side portions J11b and 11c in the abutting portion J11, and the welded metal T3 is sealed. Although the kind of welding is not limited, in this embodiment, TIG welding or MIG welding is used.

First side friction agitation step, as shown in FIG. 16, a step of friction stir along the vertical sides J11a of butting portion J11, from the start position S _M5 which is set to the fourth tab member 5 Third Friction stirring is performed without detaching the large joining rotary tool G up to the end position E _M5 set on the tab material 4. Since the start position S _M5 and the end position E _M5 are set on an extension line of the vertical side portion J11a of the abutting portion J11, friction stir can be performed at the shortest distance. On the first side surface C, a first side surface plasticizing region W11 is formed by the first side surface friction stirring step.
Moreover, after performing a 1st side surface friction stirring process, while removing the burr | flash of the 1st side surface side plasticization area | region W11, the part protruded from the 1st side surface C was also removed among weld metal T3, and the 1st side surface C was removed. Is preferably formed smoothly.

  As described above, according to the joining method according to the second embodiment of the present invention, the front side plasticized region W1 and the back side plasticized region W2 and the weld metal T3 are overlapped and formed in the first side friction stirring step. Since the first side surface plasticized region W11 and the weld metal T3 are overlapped, the abutting portion J11 can be reliably sealed.

  In this embodiment, the first side friction stirring step is performed after the welding joining step is performed. However, the present invention is not limited to this, and after the first side friction stirring step is performed first, the welding is performed. A joining process may be performed.

[Third embodiment]
Next, a third embodiment of the present invention will be described. The third embodiment of the present invention is different from the first embodiment in that, in the first side main joining step and the second side main joining step, welding is not performed and only friction stirring is performed. In addition, in the following description, although the 1st side surface main joining process is made into an example, you may carry out by a 2nd side surface main joining process.

As shown in FIG. 17, the first side surface main joining step according to the third embodiment includes a first side surface friction stirring step in which friction stirring is performed along the abutting portion J12. The abutting portion J12 includes a vertical side portion J12a and vertical side portions J12b and J12c extending vertically from both ends of the vertical side portion J12a.
In the first side frictional stirring step, the small joining rotary tool F is relatively moved from the start position S _M6 set on the fourth tab member 5 to the end position E _M6 set on the third tab member 4 in a one-stroke manner. Move and perform friction stir. In the present embodiment, the small joining rotary tool F is used, but other rotary tools may be used.

That is, the first aspect friction stir process according to the present embodiment, after press-fitting the small joining rotation tool F is rotated to the starting position S _M6, the Kazuki which is set at one end of the vertical side portion J12a of butting portion J12 The small joining rotary tool F is moved relative to the point s11. When the first starting point s11 is reached, the small joining rotary tool F is moved along the vertical side portion J12c of the abutting portion J12. Then, when the turning point m11 set near the first metal member 1a is reached, the small joining rotary tool F is moved again toward the first starting point s11. When the small joining rotary tool F reaches the first starting point s11 again, it is moved to the second starting point s12 set at the other end of the vertical side portion J12a. When the small joining rotary tool F reaches the second starting point s12, the small joining rotary tool F is moved along the vertical side portion J12b of the abutting portion J12. When the turn-around point m12 set in the vicinity of the first metal member 1a is reached, the small joining rotary tool F is moved again toward the second starting point s12. When the small joining rotary tool F reaches the second starting point s12, the small joining rotary tool F is moved toward the end position E _M6 set on the third tab member 4, and the small joining rotary tool F is detached at the end position E _M6 .

  The positions of the turning points m11 and m12 are set at positions where the first side plasticizing region W12, the front side plasticizing region W1, and the back side plasticizing region W2 formed by the first side frictional stirring step overlap. Thereby, the abutting part J12 can be sealed without a gap. Moreover, since the surface side plasticization area | region W1, the back surface side plasticization area | region W2, and the convex part N2 overlap, the abutting part J12 can be sealed more reliably.

  As described above, according to the joining method according to the third embodiment of the present invention, the abutting portion J12 can be sealed only by friction stirring without performing welding. Thereby, the watertightness and airtightness of the to-be-joined metal member 1 can be improved. Moreover, since only friction stirring is performed and welding is not performed, working time can be shortened.

Although the embodiments of the present invention have been described above, modifications can be made as appropriate without departing from the spirit of the present invention.
For example, the side main joining step may be performed only by welding without performing frictional stirring, and the butted portion exposed on the first side surface or the second side surface of the metal member to be joined may be sealed. At this time, the weld metal is sealed along the butt portion with the weld metal, and the butt portion can be sealed without a gap by overlapping the front side plasticized region and the back side plasticized region with the weld metal. . Moreover, since the welding length (butt | matching part) can be ensured longer than before by the convex part of a 1st metal member, and the recessed part of a 2nd metal member, the joining strength of a to-be-joined metal member can be raised.

  In the present embodiment, the side main bonding process includes the first side main bonding process and the second side main bonding process, but only one of them may be performed. Further, in the present embodiment, TIG welding or MIG welding is adopted as the welding method, but other welding methods may be used.

It is the perspective view which showed the joining method which concerns on 1st embodiment. It is the figure which showed the to-be-joined metal member which concerns on 1st embodiment, Comprising: (a) is a disassembled perspective view, (b) is the perspective view which showed the state faced | matched. (A) is the side view which showed the rotation tool for small joining, (b) is the side view which showed the rotation tool for large joining. It is the perspective view which showed the butt | matching process which concerns on 1st embodiment. It is the top view which showed the 1st temporary joining process which concerns on 1st embodiment. It is the top view which showed the 1st main joining process which concerns on 1st embodiment. It is the top view which showed the 2nd temporary joining process and 2nd main joining process which concern on 1st embodiment. It is the figure which showed the 1st side surface main joining process which concerns on 1st embodiment, Comprising: (a) is the perspective view which showed the ditch | groove formation process and the weld metal filling process, (b) is (a) It is a VV line sectional view of). It is the top view which showed the 1st side surface friction stirring process which concerns on 1st embodiment. It is the front view which showed the ditch | groove formation process and weld metal filling process of the 2nd side surface main joining process which concern on 1st embodiment. It is the top view which showed the 2nd side friction stirring process which concerns on 1st embodiment. It is the perspective view which showed the entering corner repair process. (A) shows the area | region of the cavity defect of the surface side plasticization area | region, (b) is the top view which showed the 1st repair process and the 2nd repair process. It is the top view which showed the 1st crossing repair process. It is the top view which showed the welding joining process which concerns on 2nd embodiment. It is the top view which showed the 1st side surface friction stirring process which concerns on 2nd embodiment. It is the top view which showed the 1st side surface friction stirring process which concerns on 3rd embodiment. It is the perspective view which showed the conventional joining method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 To-be-joined metal member 1a 1st metal member 1b 2nd metal member 2 1st tab material 3 2nd tab material A surface B back surface C 1st side surface D 2nd side surface F small size rotary tool G large size rotary tool J1 , J10 Butt part K Concave groove N Convex part O Concave part P1 Pilot hole T Weld metal W Plasticization region

Claims (6)

A bonded metal member formed by abutting a first metal member having a convex portion on a side surface and a second metal member having a concave portion on an end surface at the side surface and the end surface, and fitting the convex portion and the concave portion together. A butt process to form;
A first main joining step in which friction stir is performed from the surface of the metal member to be joined to the abutting portion of the first metal member and the second metal member;
A second main joining step in which friction agitation is performed from the back surface of the metal member to be joined to the abutting portion;
A side main joining step of performing at least one of welding and friction stirring from the side surface of the joined metal member with respect to the abutting portion,
While overlapping the surface side plasticization region formed in the first main joining step and the weld metal formed by the welding or the side side plasticization region formed by the friction stir,
The joining method characterized by making the back surface side plasticization area | region formed by said 2nd main joining process overlap with the weld metal formed by the said welding, or the side surface side plasticization area | region formed by the said friction stirring.   The joining method according to claim 1, wherein at least one of the front surface side plasticized region and the back surface side plasticized region is in contact with the convex portion. The convex portion tapers in a direction away from the first metal member,
The joining method according to claim 1, wherein the concave portion is tapered toward a direction away from the end face of the second metal member.   Before the side surface main joining step, a concave groove forming step for forming a concave groove in advance along the abutting portion exposed on the side surface of the metal member to be joined, and welding metal filling for filling the concave groove with the weld metal The joining method according to claim 1, further comprising a step.   The joining method according to claim 4, further comprising a cutting step of cutting the weld metal protruding from the side surface of the bonded metal member in the weld metal filling step. In the corner of the joined metal member formed by one side surface of the first metal member and one side surface of the second metal member,
The entrance corner repairing step of performing frictional stirring using a rotary tool is included in at least one of the front side plasticization region and the back side plasticization region exposed to the entrance corner. The joining method according to any one of claims 1 to 5.

Images