JP2011088162A - Submerged arc welding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide submerged arc welding equipment that can improve welding operation efficiency by surely preventing leakage of flux in upward submerged welding. <P>SOLUTION: In upward submerged arc welding, the periphery of a weld zone is covered with a cloth member (30), with the side part (66) of the cloth member pressurized by pressurizing plates (52), and with the lower part (68) pressurized by the respective pressurizing plates (52) that are arrayed on an axial member 36, thereby forming a flux receiving region. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a submerged arc welding apparatus that realizes submerged arc welding in a standing posture.

In the submerged arc welding method, powdery flux is sprayed on the work piece (base material) in advance, and the welding wire is fed into it to generate an arc between the welding wire and the work piece. And a welding method in which the workpiece and the welding wire are melt-bonded by the arc heat.
In such submerged arc welding, (1) since a large current can be used, the welding speed is large and the efficiency is high, (2) the penetration is deep, and (3) the arc is covered with a flux, so no light shielding is required. In addition, since welding fume is hardly generated, there is an advantage that the working environment is good and (4) the bead appearance is beautiful.

  However, the conventional submerged arc welding method requires the flux to stay in the joints (butt joints, groove joints, lap joints, fillet joints, etc.) of the work piece. It was limited to that and could not be applied to the standing posture. In addition, the “standing posture” in welding refers to a posture in the case of welding an object to be welded such that a welding line extends in the height direction.

Therefore, development of a submerged arc welding apparatus capable of performing submerged arc welding in an upright posture is underway (see Patent Document 1).
This is to provide a flux receiver that abuts the peripheral part with the work piece and retains the flux inside, and moves upward along the welding line while supplying flux to the flux receiver to perform submerged arc welding. is there.

JP 2007-307570 A

In the technique disclosed in Patent Document 1, the flux receiver is provided with flux leakage prevention means, and the flux leakage prevention means has a skirt portion that extends to the left and right outer sides and the lower side with respect to the surface of the workpiece to be welded. It is supported by the elastic member.
However, in the configuration in which the skirt portion is supported by the elastic member, there is a gap between the elastic members, and there is a problem that the flux held inside leaks through the gap. For this reason, there is a possibility that the flux is scattered around the welding work place and the working environment is deteriorated. Moreover, the consumption of the flux retained in the flux receiver is large, and a large amount of flux must be supplied accordingly. As described above, leakage of flux from the flux receiver deteriorates work efficiency.

However, the surface of the workpiece may be uneven, and flux leakage cannot be reliably prevented unless the periphery of the flux receiver is brought into contact with the workpiece while corresponding to such irregularities.
The present invention has been made to solve such a problem, and the object of the present invention is to achieve a submerging capable of reliably preventing flux leakage and improving welding work efficiency in vertical submerged arc welding. An object is to provide an arc welding apparatus.

  In order to achieve the above-described object, the submerged arc welding apparatus according to claim 1 is a submerged arc welding apparatus that performs submerged arc welding on a work piece that is installed in a standing posture and whose welding line extends in the height direction. A welding torch for supplying a welding wire to the workpiece, and covering a periphery of a welding portion of the workpiece, at least a side edge and a lower edge contacting the workpiece, and flux together with the workpiece. A storage body that forms a flux receiving area to be stored; a flux supply means that supplies flux into the flux receiving area; a support member that supports the storage body; and a side portion of the storage body that is provided on the support member. Flux leakage having side pressing means for pressing the peripheral edge toward the workpiece and lower pressing means for pressing the lower peripheral edge of the housing toward the workpiece. The lower pressing means of the flux leakage preventing means is pivotally supported by an action portion that presses the storage body, a weight portion heavier than the action portion, and a shaft member provided on the support member. It is characterized by having a structure in which a plurality of pressing members, each including a shaft support portion, which are arranged in the width direction, are arranged continuously in the width direction, with the shaft support portion serving as a fulcrum and converting the weight of the weight portion into the pressing force of the action portion.

The submerged arc welding apparatus according to claim 2 is characterized in that, in claim 1, the storage body is a cloth member having heat resistance.
A submerged arc welding apparatus according to a third aspect of the present invention is the submerged arc welding apparatus according to the first or second aspect, wherein a groove along the weld line is formed on the workpiece, and the width of the action portion of the pressing member is at least that of the workpiece. It is characterized by being smaller than the groove width.

The submerged arc welding apparatus according to claim 4 is characterized in that, in any one of claims 1 to 3, the lower pressing means of the flux leakage preventing means can replace the pressing member with another pressing member. .
In the submerged arc welding apparatus according to claim 5, in any one of claims 1 to 4, the lower pressing means of the flux leakage preventing means can replace the weight portion of the pressing member with another weight portion having a different weight. It is characterized by being.

In a submerged arc welding apparatus according to a sixth aspect, in any one of the first to fifth aspects, the pressing member has the action portion on one end side, the weight portion on the other end side, and the weight portion between the action portion and the weight portion. It is the plate member in which the axial support part was formed.
The submerged arc welding apparatus according to claim 7 is the submerged arc welding apparatus according to any one of claims 1 to 6, wherein the side portion pressing means of the flux leakage preventing means has at least a height of the welding portion from a lateral position of a pressing portion of the lower pressing means. It is the board member extended so far.

  In the submerged arc welding apparatus according to claim 1 of the present invention using the above means, in the vertical submerged arc welding, a flux receiving region is formed by the storage body around the welding location, and the lower portion of the storage body is formed in the width direction. It presses with each pressing member arranged in multiple numbers. The pressing member includes an action part that presses the storage body, a weight part that is heavier than the action part, and a shaft support part that is supported by a shaft member provided on the support member, and the weight of the weight part is determined with the shaft support part as a fulcrum. This is converted into the pressing force of the action part.

Thus, the said lower part of a storage body can be pressed without a gap | interval by arranging in multiple the pressing member which presses a lower part of a storage body continuously in the width direction. In addition, each pressing member independently presses the workpiece to be welded, so that the storage body can be pressed to the workpiece side according to the surface shape of the workpiece and conform to the unevenness of the surface of the workpiece. .
Thereby, the flux receiving area | region lower part is obstruct | occluded and the leakage of a flux can be prevented. And a flux supply amount can be reduced and welding work efficiency can be improved.

According to the submerged arc welding apparatus of the second aspect, the storage body is a cloth member having heat resistance.
Thus, the flux receiving region can be easily formed by using a flexible cloth member having heat resistance as the storage body.
According to the submerged arc welding apparatus of the third aspect, the width of the action portion of the pressing member is at least smaller than the groove width of the workpiece. Thereby, a storage body can be pressed according to the bead shape after welding, and the leak of a flux can be prevented more reliably.

According to the submerged arc welding apparatus of the fourth aspect, the pressing member of the lower pressing means can be replaced with another pressing member.
Thereby, the optimal pressing member according to a to-be-welded object can be selected, and the leak of a flux can be prevented with respect to various to-be-welded objects.
According to the submerged arc welding apparatus of the fifth aspect, the weight portion of the pressing member of the lower pressing means can be replaced with another weight portion having a different weight.

Thereby, it is possible to select an optimum pressing member corresponding to the workpiece to be welded by a simple replacement operation, and it is possible to prevent leakage of flux with respect to various workpieces.
According to the submerged arc welding apparatus of the sixth aspect, the pressing member is a plate member having an action portion on one end side, a weight portion on the other end side, and a shaft support portion formed between the action portion and the weight portion.
Thereby, the lower periphery of a storage body can be pressed with a simple structure.

According to the submerged arc welding apparatus of the seventh aspect, the side pressing means is a plate member extending at least from the lateral position of the pressing portion of the lower pressing means to the height of the welding location. Thus, the side part periphery of a storage body is pressed with a simple structure.
Thus, together with the lower pressing means, the lower part is closed from the side part of the storage body without any gap, and leakage of the flux from the side part can be prevented, and the flux can be reliably supplied to the welding location.

It is a side view of the embodiment concerning the submerged arc welding apparatus of the present invention. It is a perspective view of an embodiment concerning a submerged arc welding apparatus of the present invention. It is a perspective view except a cloth member of an embodiment concerning a submerged arc welding device of the present invention. It is a principal part perspective view of embodiment which concerns on the submerged arc welding apparatus of this invention. It is a longitudinal cross-sectional view at the time of welding of embodiment which concerns on the submerged arc welding apparatus of this invention. It is a transverse cross section of a press plate contact portion in an embodiment concerning a submerged arc welding device of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Referring to FIGS. 1 to 3, FIG. 1 shows a side view of an embodiment of a submerged arc welding apparatus according to the present invention, and FIGS.
A welding machine 1 shown in FIG. 1 is a vertical submerged welding machine installed in a vertical posture, and is formed by extending a pair of plate-like workpieces 2 and 2 that are erected and extending in the height direction. Submerged arc welding is performed on an object to be welded with a weld line at the center of the groove.

The welding machine 1 mainly includes a moving mechanism 10, a welding torch 12, a flux receiver 14, and a flux supply unit 16 (flux supply means).
Specifically, in the moving mechanism 10, a rail connecting member 22 slidable up and down is connected to a rail member 20 erected in parallel with the workpieces 2 and 2, and a main body portion 24 is connected to the rail connecting member 22. It is supported. The moving mechanism 10 is movable in the vertical direction along the rail member 20 by driving a motor.

  In addition, the moving mechanism 10 is provided with a welding torch 12, a flux receiver 14, a position adjusting device for the flux feeder 16, a control device for controlling the operation of each device, and the like (not shown). For example, the position adjusting device moves the welding torch 12, the flux receiver 14, and the flux feeder 16 in the horizontal direction. The control device controls the power supply to the welding torch 12, the flux supply amount by the flux supply machine 16, and the like.

The welding torch 12 is supported by the main body 24 of the moving mechanism 10. The welding torch 12 is configured such that the welding wire 12a is fed from a wire feeding device (not shown) via a cable 26. The welding wire 12a protrudes from the front end portion of the welding torch 12, and is directed to the welded portion of the groove in a substantially vertical direction with respect to the workpiece 2.
The flux receiver 14 includes a frame member 28 (support member) connected to the main body 24 of the moving mechanism 10, and a heat-resistant cloth member 30 (for example, glass wool or aramid fiber supported by the frame member 28). Storage body).

  The frame member 28 includes side frames 32 and 32 that are positioned on both sides in the width direction and extend in the vertical direction, and the lower portions of the side frames 32 and 32 are connected by a connecting pipe 34 and a shaft member 36. Both end portions of the shaft member 36 extend outward through the side frames 32, 32, and one end portions of spring members 38, 38 are locked to the end portions of the shaft member 36. Further, the substantially central portions of the side frames 32 and 32 in the height direction are connected by a central frame 40 having a substantially semicircular shape when viewed from above, and the upper portions of the side frames 32 and 32 are generally U-shaped when viewed from above. The upper frame 42 is connected.

  Intermediate rotation frames 44 and 44 are supported on the upper portions of the side frames 32 and 32 so as to be rotatable in the vertical direction. The intermediate rotation frame 44 is a plate member that is long in one direction, and holes 44a are formed at equal intervals in the length direction. The intermediate rotating frame 44 is supported by the side frame 32 via a fastening member in a hole 44a on one end side slightly from the center, and the spring member 38 is provided in the hole 44a on one end side via a fastening member. The other end is locked, and a pressing frame 46 (side pressing means) is rotatably supported by a hole 44a on the other end side via a fastening member.

  The pressing frame 46 is also a plate member that is long in one direction, and holes 46a are formed at equal intervals in the length direction. The hole 46a on the one end side slightly from the center is supported via a fastening member, and one end of the chain member 48 is locked to the fastening member. A cylindrical member 50 is provided on the other end side of the chain members 48, 48 so as to connect the left and right chain members 48, 48.

When the pressing frame 46 comes into contact with the work piece 2, the spring member 38 provided on one end side is extended by moving the work piece 2 side of the intermediate rotation frame 44 downward, and this spring member 38. The elastic force is converted into a pressing force by which the pressing frame 46 presses the workpiece 2 via the intermediate rotation frame 44.
Further, the shaft member 36 is provided with a flux leakage prevention mechanism 54 (lower pressing means) in which a plurality of pressing plates 52 are arranged along the axial direction.

Specifically, FIG. 4 shows a perspective view of the main part, and the flux leakage prevention mechanism 54 will be described in detail with reference to FIG. In FIG. 4, for convenience of explanation, the side frame on the front side of the drawing is not shown.
As shown in FIG. 4, the flux leakage prevention mechanism 54 in the present embodiment is configured by arranging nine pressing plates 52.

  Each pressing plate 52 is rotatably supported by the shaft member 36 and extends downward, a pressing portion 58 extending obliquely downward from the lower end portion of the shaft supporting portion 56 toward the workpiece 2 side, and A substantially inverted Y-shape is formed of a weight connecting portion 60 extending in the horizontal direction from the lower end portion of the shaft support portion 56 to the side away from the workpiece 2, and a disc-like weight portion 62 is formed at the tip of the weight connecting portion 60. Is formed.

  The press plates 52 can be rotated independently of each other while being arranged with almost no gap. Moreover, the thickness of each pressing plate 52 in the width direction is smaller than the groove width of the workpieces 2 and 2. Further, the pressing plate 52 can be removed from the shaft member 36 and replaced with another pressing plate. Therefore, according to the work piece 2, it is possible to change the weight 62 to a different pressure plate, to change the thickness of the pressure plate, or to change the number of pressure plates by changing the thickness. It is.

  When the flux leakage prevention mechanism 54 is not used without welding, as shown in FIG. 4, the cylindrical member 50 is engaged with the branch portion at the lower end of the shaft support portion 56 of the pressing plate 52 so that each pressing plate 52 Aligned. On the other hand, at the time of welding, the cylindrical member 50 is removed from the branch portion of the pressing plate 52, and each pressing plate 52 can be independently rotated. The weight portion 62 of the pressing plate 52 is heavier than the pressing portion 58, and when the cylindrical member 50 is detached, the weight portion 62 is lowered with the shaft member 36 as a fulcrum, and the pressing portion 58 is turned up. Has been. That is, when the pressing portion 58 contacts the workpiece 2, the pressing plate 52 presses the weight of the weight portion 62 with the shaft supporting portion of the shaft supporting portion 56 as a fulcrum and presses the workpiece 2 by the pressing portion 58. It is configured to convert to pressure.

  1 to 3, the cloth member 30 is supported by being surrounded by side frames 32 and 32, a center frame 40, and an upper frame 42 of the frame member 28. In the cloth member 30, the welding torch 12 is passed through the center of a rectangular support portion 64 surrounded by the frames 32, 32, 40, 42. The cloth member 30 has side portions 66 and 66 and a lower portion 68 extending from the support portion 64 toward the workpiece 2 side.

  At the time of welding, the cloth member 30 has the peripheral portions of the side portions 66, 66 by the pressing frames 46, 46, and the peripheral portion of the lower portion 68 by the end of the pressing portion 58 of each pressing plate 52, respectively. Pressed to the side. As a result, the cloth member 30 opens the side surface and the upper surface on the workpiece 2 side, and the side portions 66, 66 and the lower portion 68 are in contact with the workpieces 2 and 2 without gaps, and around the welded portion. The flux receiving area is formed by covering the cloth member 30 and the work piece 2.

The flux supply device 16 is provided with a flux supply source (not shown) so that a flux supply nozzle 70 extending from the flux supply source faces the flux receiving region formed by the cloth member 30 of the flux receiver 14 from above. Has been.
Hereinafter, the operation of the submerged arc welding apparatus according to the present invention configured as described above will be described.

Referring now to FIGS. 5 and 6, FIG. 5 shows a longitudinal sectional view during welding of the embodiment of the submerged arc welding apparatus of the present invention, and FIG. 6 shows a transverse sectional view of the pressing plate contact portion. Hereinafter, description will be given with reference to FIGS.
At the time of welding, first, the moving mechanism 10 is moved to a height corresponding to the welding location, and then the welding torch 12, the flux receiver 14, and the flux feeder 16 are moved to predetermined welding positions by the position adjusting means. At this time, by moving the flux receiver 14 to the workpiece 2 side, the peripheral edges of the side portion 66 and the lower portion 68 of the cloth member 30 are in contact with the workpiece 2 and further the pressing frames 46 and 46 and the pressing plate 52. The pressing portion 58 is pressed toward the workpiece 2 side.

Specifically, after the pressing frames 46 and 46 and the pressing plate 52 come into contact with the workpiece 2 through the cloth member 30, the pressing frames 46 and 46 are moved intermediately by bringing the flux receiver 14 closer to the workpiece 2. The elastic force of the spring member 38 via the moving plate 44 becomes the pressing force, and the pressing plate 52 presses the cloth member 30 with the weight of the weight portion 62 as the pressing force.
Moreover, since each press plate 52 of the flux leakage prevention mechanism 54 can be rotated independently, the press part 58 of each press plate 52 rotates according to the unevenness | corrugation of the to-be-welded object 2 and 2 surface.

For example, as shown in FIG. 6, even when the bead B formed after welding is higher than the surfaces of the workpieces 2 and 2, the pressing plate 52 having a width smaller than the groove width is the bead B The cloth member 30 is pressed step by step according to the shape.
And the cloth member 30 by which the periphery of the side part 66 and the lower part 68 was pressed in this way forms a flux receiving area | region inside with the to-be-welded object 2. FIG. The flux F is supplied to the flux receiving area from the flux supply nozzle 70 of the flux supply machine 16. Since the side portion 66 and the lower portion 68 of the cloth member 30 are in contact with the workpiece 2 with almost no gap and the side portion 66 and the lower portion 68 of the flux receiving area are closed, the flux F stays in the flux receiving area. To do.

When the welding part is covered with the flux F, electric power is supplied to the welding torch 12 to start arc welding. And the moving mechanism 10 performs standing submerged arc welding by moving from the bottom to the top along the rail member 20 according to welding conditions.
As described above, in the vertical submerged arc welding, the flux receiving region is formed by the cloth member 30 around the welding portion, and the lower portions 68 of the cloth member 30 are formed by the plurality of pressing plates 52 arranged in the width direction. Press.

  By arranging a plurality of pressing plates 52 that press the lower portion 68 of the cloth member 30 continuously in the width direction, the lower portion 68 of the cloth member 30 can be pressed without a gap. In addition, each pressing plate 52 independently presses the workpiece 2 so that the cloth member 30 is fitted to the workpiece 2 side according to the surface shape of the workpiece 2 according to the unevenness of the surface of the workpiece 2. Can be pressed. In particular, since the width of the pressing plate 52 is smaller than the groove width, the cloth member 30 can be pressed in conformity with the bead B shape after welding, and the lower part of the flux receiving area is more reliably closed. can do.

  And in the side part 66 of the cloth member 30, since it is pressed to the to-be-welded object 2 side by the press frame 46 extended to the upper direction from the welding wire 12a corresponded to a welding location from the horizontal position of the press plate 52 tip, The member 30 is in contact with the workpiece 2 from the lower portion 68 to the side portion 66 without any gap. Thereby, the flux receiving area | region with which the lower part 68 and the side part 66 were obstruct | occluded is formed, and a flux can be reliably supplied to a welding location in the said flux receiving area | region.

Moreover, a flux receiving area | region can be easily formed by forming a flux receiving area | region with the cloth member 30 which is flexible and has heat resistance.
In this way, the submerged arc welding apparatus according to the present invention can reliably close the lower and side portions of the flux receiving area to prevent leakage of the flux F, reduce the flux supply amount, and improve the welding work efficiency. Can be made.

In addition, since the pressing plate 52 can be replaced with another pressing plate, an optimal pressing plate can be selected according to the workpiece, and flux leakage can be prevented with respect to various workpieces. Can do.
Although the description about embodiment of the submerged arc welding apparatus which concerns on this invention is finished above, embodiment is not restricted to the said embodiment.

In the said embodiment, although the flux receiving area | region is formed with the cloth member 30, the storage body which forms a flux receiving area | region is not restricted to this. For example, a metal net may be used. Or the container etc. which made the part supported by a frame member into a box member, and made the flexible member only in the peripheral part which contacts a to-be-welded object may be sufficient.
Moreover, in the said embodiment, although each of the press plates 52 is a structure which can be replaced | exchanged, for example, a weight part can be removed from a weight connection part, and the structure which can replace only a weight part may be sufficient. . Alternatively, the pressing force acting on the pressing portion may be changed by changing the position of the weight portion or adjusting the length of the weight connecting portion. For these reasons, it is possible to more easily change the pressing force by the pressing plate.

Moreover, in the said embodiment, although the press plate 52 has comprised reverse Y shape, the shape of a press plate is not restricted to this, What is the structure which can convert the weight of a weight part into the pressing force by a press part. That's fine.
Moreover, in the said embodiment, although the press frames 46 and 46 are using the elastic force of the spring member 38 via the intermediate | middle rotation plate 44 as a pressing force, the pressing force by the said pressing frame is not restricted to this, For example, An elastic body other than a spring may be used.

DESCRIPTION OF SYMBOLS 1 Welding machine 2 Work piece 10 Moving mechanism 12 Welding torch 14 Flux receiver 16 Flux supply machine (flux supply means)
28 Frame member (support member)
30 Cloth member (container)
36 Shaft member 46 Pressing frame (flux leakage preventing means, side pressing means)
52 Pressing plate (pressing member)
54 Flux leakage prevention mechanism (flux leakage prevention means, lower pressing means)
56 Shaft support 58 Press part (action part)
60 Weight connection portion 62 Weight portion 64 Support portion 66 Side portion 68 Lower portion 70 Flux supply nozzle

Claims (7)

A submerged arc welding apparatus that performs submerged arc welding on a work piece that is installed in a vertical posture and whose welding line extends in the height direction,
A welding torch for supplying a welding wire to the workpiece,
Covering the periphery of the welded part of the workpiece, at least the side edge and the lower edge are in contact with the workpiece, and a storage body that forms a flux receiving region that stores the flux together with the workpiece;
Flux supply means for supplying flux into the flux receiving area;
A support member for supporting the storage body;
Flux leakage preventing means provided on the support member, comprising a side pressing means for pressing the side peripheral edge of the storage body toward the workpiece, and a lower pressing means for pressing the lower peripheral edge of the storage body toward the workpiece. And comprising
The lower pressing means of the flux leakage preventing means includes an action part that presses the storage body, a weight part that is heavier than the action part, and a shaft support part that is supported by a shaft member provided on the support member. A submerged arc welding apparatus characterized in that a plurality of pressing members that convert a weight of the weight portion into a pressing force of the action portion with a supporting portion as a fulcrum are continuously arranged in the width direction.   The submerged arc welding apparatus according to claim 1, wherein the storage body is a cloth member having heat resistance. The workpiece is formed with a groove along the weld line,
The submerged arc welding apparatus according to claim 1 or 2, wherein a width of the action portion of the pressing member is at least smaller than a groove width of the workpiece.   The submerged arc welding apparatus according to any one of claims 1 to 3, wherein the lower pressing means of the flux leakage preventing means can replace the pressing member with another pressing member.   The submerged arc according to any one of claims 1 to 4, wherein the lower pressing means of the flux leakage preventing means can replace the weight portion of the pressing member with another weight portion having a different weight. Welding equipment.   6. The pressing member is a plate member in which the action portion is formed on one end side, the weight portion is provided on the other end side, and the shaft support portion is formed between the action portion and the weight portion. The submerged arc welding apparatus according to any one of the above.   The said side part press means of the said flux leak prevention means is a plate member extended from the lateral position of the press part of the said lower press means to the said welding location height at least. The described submerged arc welding apparatus.

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