JP2002001542A - Torch for hot wire gma welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small size torch for hot wire GMA welding capable of stably conducting contact conduction to welding wire and hot wire by feeding both wire with one single torch. SOLUTION: This torch for welding is used for welding by inserting a conduit 7 for welding and a conduit 8 for hot wire from the rear part of a cylindrical body and feeding out welding wire 1 and hot adding wire 2 from the front part thereof. In the front part of inside the cylindrical body, a current-carrying body 5 which connects to the conduit 7 and guides the welding wire 1, a current- carrying body 6 which connects to the conduit 8 and guides the adding wire 2, an insulating ceramic guide 3 which is mounted on the front parts of the bodies 5 and 6 and has two triangular through holes 17 and 18 guiding the wire 1 and 2, current-carrying tip 9a wherein one end is supported by the body 5 and the other end contacts to the welding wire 1, an current-carrying tip 9b wherein one end is supported by the body 6 and the other end contacts to the adding wire 2, and springs 10a and 10b which press the current-carrying tips 9a and 9b are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a GMA (Gas Metal
Arc) Hot wire G used for hot wire GMA welding combining welding and hot wire addition with current heating
It relates to a torch for MA welding.

[0002]

2. Description of the Related Art In a hot wire GMA welding method, in addition to a welding wire which is an expendable electrode generating an arc in a shielding gas, a welding pool formed on the surface of a workpiece (referred to as a base material) by an arc is electrically heated. This is a welding method for supplying a hot wire, which aims to increase the efficiency of welding by supplying both a welding wire and a hot wire.

FIG. 4 shows a typical hot wire G of the prior art.
1 shows a configuration of an MA welding device. This hot wire GMA welding device includes a GMA welding related device and a hot wire related device.

[0004] The GMA welding-related equipment includes a welding torch 25 arranged opposite to a base material 32, a wire feeder 23 for feeding the welding wire 1 to the welding torch 25, and a delivery from the base material 32 and the welding torch 25. A GMA welding power supply 21 for supplying electric power for forming an arc with the welding wire 1;
A cable 27 for connecting an arc current to connect the GMA welding power supply 21 and the wire supply device 23, and a conduit cable connecting the wire supply device 23 and the welding torch 25 and integrally incorporating a wire supply liner, an arc current supply cable, and a gas hose. 30 and a ground-side conducting cable 29 connecting the base material 32 and the welding power source 21.

[0005] The hot wire equipment is a welding torch 25.
, A hot wire supply torch 26 attached to the torch 26 by a connecting member 33, a hot wire feeding device 24 for feeding the hot wire 2 to the torch 26, a hot wire heating power supply 22 for supplying electric power for heating the hot wire 2, The wire 28 for the wire heating current connecting the heating power supply 22 and the hot wire feeding device 24, the wire feeding device 24 and the hot wire feeding torch 26 are connected, and the wire feeding liner and the wire energizing cable are integrated. It is composed of a conduit cable 31 and the like.

In this hot wire GMA welding apparatus, G
The tip of the hot wire is inserted toward the molten pool formed by generating the arc of MA welding, and GMA welding is performed at a high welding speed with the addition of the metal deposited by the addition of the hot wire.

FIG. 5 is a view showing the vicinity of a torch of a hot wire GMA welding apparatus disclosed in Japanese Patent Application Laid-Open No. 2-169183. Around this torch, a welding torch 59 for delivering a welding wire 1 serving as a consumable electrode, and a welding torch 59
And a hot wire supply torch 50 which is connected to the side and feeds an additive wire. The hot wire supply torch 50 includes a conduit cable 55, a power supply nozzle 51 for electrically heating the additive wire 2 sent through the conduit cable 55, and a wire guide for sending the heated hot wire 2 to a molten pool of the base material. And a chip 52. The conduit cable 55 has a guide tube for feeding the addition wire 2 and a cable for feeding power to the power supply nozzle 51. The power supply nozzle 51 is bent at a curvature of 15 to 20 ° in order to keep a power supply location for the additive wire 2 constant, and a wire guide chip 52 attached to the tip thereof uses an insulating material.

FIG. 6 is a view showing a torch for hot wire GMA welding disclosed in Japanese Utility Model Laid-Open No. 4-463. This hot wire GMA welding torch sends out the welding wire 1 and the addition wire 2 in parallel from inside the shield nozzle 62 at the tip of the torch. A conductive contact tube 64 for feeding power while feeding the welding wire 1 and an insulating contact tube 65 for feeding hot wire 2 are arranged in parallel at the axis of the cylindrical shield nozzle 62. The positions of the tubes 64 and 65 are fixed by insulating guides 68 and 69. Power supply to the addition wire 2 is performed near an addition wire feeding device (see the device 24 shown in FIG. 4). The hot wire GMA welding torch shown in FIG. 6 has a simple structure and is characterized in that it can be miniaturized.

[0009]

In the conventional general apparatus shown in FIG. 4, the periphery of the torch is constituted by connecting two torches, a welding torch 25 and a linear hot wire supply torch 26. Therefore, there is a problem that the size is large and handling is troublesome.

The periphery of the torch shown in FIG. 5 is constructed by connecting the welding torch 59 and the hot wire supply torch 50, but the hot wire supply torch 50 is curved to reduce the size. The hot wire supply torch 50 has a wire guide tip 52 made of ceramic at the tip of the torch. Therefore, since the movement of the wire on the side of the power supply nozzle 51 is also restricted by the wire guide tip 52, it is necessary to use a power supply nozzle bent at a curvature of 15 to 20 ° in order to supply power to the filler wire and stabilize the power supply point. become,
For this reason, there is a problem in securing the wire feeding stability, for example, the wire feeding resistance is increased and the feeding speed is likely to be uneven. The most common torch for GMA is used as a welding torch. The power supply to the consumable electrode wire is performed by a contact tip (not shown), which uses a contact bend habit to make use of the bending tendency of the wire. Therefore, the basic problem in normal GMA welding, that is, the power supply is unstable due to the consumption of the conductive tip. And more arc breaks and spatters occur.
There was a problem that the bead easily meandered.

In the wire torch for GMA shown in FIG. 6, since the contact current is also applied utilizing the wire bending tendency, there are problems such as arc breaking and spatter generation.
On the hot wire side, the wire is energized near the filler wire feeder away from the torch, so even though the wire is energized and heated, the entire long wire from the filler wire feeder to the base material becomes hot. However, there is a problem that it is difficult to heat it to 300 ° C. or more even at the torch outlet, and there will be no difference from the case where the wire is added without energizing the wire.

An object of the present invention is to supply a welding wire and a hot wire through a single torch, and to stably energize contact with both wires so that a small hot wire G can be provided.
An object of the present invention is to provide a torch for MA welding.

[0013]

In order to achieve the above object, a hot wire GMA welding torch according to the present invention has a first structure in which a welding wire conduit, an energizing cable and a shielding gas hose are integrally incorporated from the rear of a cylindrical body. And a second conduit cable integrally incorporating the additive wire conduit and another energized cable,
In a hot wire GMA welding torch for performing welding by sending a welding wire and an additional wire together with a shielding gas from a front portion, a first conductor having a hole connected to an energizing cable and guiding a welding wire is provided at a front portion in a cylinder. A second conductor having a hole connected to another current-carrying cable and guiding the addition wire, and an insulation having two triangular holes attached to the front of the first and second conductors and guiding the welding wire and the addition wire. A conductive ceramic guide, a first conductive tip having one end supported by the first conductor and the other end in contact with the front end of the welding wire, a first spring member for pressing the first conductive tip against the welding wire, A second conductive tip, one end of which is supported by the second conductor body and the other end of which is in contact with the addition wire through an opening provided at the boundary between the second conductor and the ceramic guide; Characterized in that a second spring member for pressing the pressing wire. In addition, the opening provided for bringing the second energizing tip into contact with the additional wire may be provided on either the first conductor side or the ceramic guide side.

The hot wire GM configured as described above
When welding with an A welding torch, the welding wire is
It is sent forward from the welding wire conduit of the first conduit cable through the guide hole of the first conductor, one triangular hole of the ceramic guide, and is energized by the first energizing tip held by the first spring member, An arc is generated between the base materials facing the torch to form a molten pool on the base material. On the other hand, the addition wire is sent forward from the addition wire conduit of the second conduit cable through the guide hole of the second conductor and the other triangular hole of the ceramic guide, and the second energization pressed by the second spring member. It is heated by the tip and heated to a high temperature by the conduction between the current-carrying point and the base material, and supplied to the molten pool as a hot wire.

Thus, the torch for hot wire GMA welding of the present invention can be supplied with a welding wire and a hot wire through a single torch, so that the torch can be miniaturized, so that the handling becomes easy. In addition, the two wires are constantly pressed by the spring member, so that the contact energization can be stably performed. In particular, the welding wire does not have an arc break due to the stable energization, thereby preventing generation of spatter due to the arc. In addition, the hole of the ceramic guide that guides the wire has a triangular cross section, so that foreign matter such as wire chips generated when the wire rubs into the hole can be discharged through the corner of the triangular hole, and the wire can be smooth without clogging the hole. Can be sent.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the hot wire GMA welding method will be briefly described. In this welding method, in addition to the welding wire, which is a consumable electrode that generates an arc in the shielding gas, an additional wire that is electrically heated is supplied as a hot wire to the molten pool formed on the surface of the workpiece by the arc. is there. In addition, the hot wire GM of the present invention
The welding device using the A welding torch has the same overall configuration as that shown in FIG. 4 except for around the torch, and includes a GMA welding power source, a welding wire supply device, a hot wire supply device,
It is equipped with cables and hoses in addition to a hot wire heating power supply.

An embodiment of the torch for hot wire GMA welding according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a tip side of a torch for hot wire GMA welding according to an embodiment of the present invention, and illustrates a torch configuration of an invention part. 2 is a sectional view taken along the line II-II of FIG.
FIG. 3 is a sectional view taken along line III-III of FIG. 1. This hot wire GM
Although not shown, the entire torch for welding A is a cylindrical body having a length of about 150 mm. The cylindrical body of the torch for hot wire GMA welding includes a torch outer cylinder 20 and a shield nozzle 11 attached to a tip of the outer cylinder 20. A conduit cable 7 for GMA and a conduit cable 8 for hot wire are inserted into the torch outer cylinder 20, and a ceramic guide 3 for guiding the welding wire 1 and the additive wire 2, , 2 are provided with first and second conductors 5 and 6, which are current conductors, and conducting chips 9a and 9b which are in contact with the respective wires.

In the torch barrel 20, the inserted GMA
The distal ends of the conduit cable 7 for hot wire and the conduit cable 8 for hot wire are fixed to the holding block 19 provided at the boundary between the torch outer cylinder 20 and the torch outer cylinder 20 by bolts 13 and clamp rings 14, respectively. GM
The conduit cable 7 for A incorporates a wire feed liner as a welding wire conduit for feeding the welding wire 1, an arc current supply cable and a gas hose integrally, but the wire supply liner, the arc current supply Only the cable extends to the holding block 19. The gas hose sends the shielding gas into the torch outer cylinder 20. The conduit cable 8 for a hot wire integrally incorporates a wire feed liner and a wire energizing cable as an addition wire conduit for feeding the addition wire 2, and both the liner and the cable extend to the holding block 19. . In addition, the holding block 19 is provided with a plurality of through holes 12 communicating from the inside of the torch outer cylinder 20 to the inside of the shield nozzle 11, and the shield gas introduced into the space inside the torch outer cylinder 20 is evenly distributed inside the shield nozzle 11. Plays the role of a flow straightening plate that flows out.

On the other hand, in the shield nozzle 11, a GMA body 5 connected to the arc current carrying cable 7 and having a round hole 5a for guiding the welding wire 1 is disposed extending forward from the holding block 19. A hot wire body 6 having a round hole 6a connected to the wire energizing cable 8 and guiding the addition wire 2 is arranged to extend forward from the holding block 19. And GM
A ceramic guide 3 extending forward is sandwiched between the A body 5 and the hot wire body 6. The bodies 5 and 6 are conductors, and the ceramic guide 3 is an insulator made of, for example, silicon nitride.

The ceramic guide 3 comprises a ceramic guide body 3a extending forward between the body 5 for GMA and the body 6 for hot wire, and pressing plates 3b and 3c attached to the front side surface of the body 3a. .

The ceramic guide body 3a has a quadrangular cross section, and triangular grooves for guiding wires are formed on two back-to-back surfaces (one surface is long and the other surface is short as described later). . That is, a triangular groove 17 for introducing and guiding the welding wire 1 fed through the guide hole 5a of the GMA body 5 is provided on one of the two surfaces, and a hot wire body is provided on the other of the two surfaces. 6 is provided with a triangular groove 18 for introducing and guiding the addition wire 2 sent through the guide hole 6a. In order to align the position of the guide hole 5a of the GMA body 5 with the position of the triangular groove 17 of the ceramic guide body 3a, the GMA body 5 is provided with a step whose cross section is reduced in the middle in the longitudinal direction, and the guide hole 5a is formed in the step surface. Exit is provided. By aligning the step surface of the GMA body 5 with the rear end face of the ceramic guide body 3a, the exit of the guide hole 5a on the GMA body 5 side and the triangular groove 17 (two back-to-back faces) opening in the rear end face of the ceramic guide body 3a And the body 5 is assembled such that the inner surface in front of the step covers the triangular groove 17 of the ceramic guide body 3a. In order to align the position of the guide hole 6a of the hot wire body 6 with the position of the other triangular groove 18, the ceramic guide body 3a is provided with a step whose cross section is enlarged in the middle in the longitudinal direction, and a triangular groove is formed on the outer surface in front of the step. 18 (the shorter of the two back-to-back surfaces). By aligning the front end face of the hot wire body 6 with the step surface of the ceramic guide body 3a, the exit of the guide hole 6a of the hot wire body 6 and the entrance of the triangular groove 18 on the ceramic guide body 3a side are aligned. . A holding plate 3b that covers the triangular groove 17 and forms a triangular hole and a holding plate 3c that covers the triangular groove 18 and forms a triangular hole are attached to the front side surface of the ceramic guide body 3a by bolts or the like. ing. Note that the ceramic guide body 3a and the hot wire body 6 are adhered on the side surface (the portion indicated by the symbol "A" in FIG. 1).

The GMA body 5 has one end supported on the outer surface and the other end in contact with the welding wire 1 sent from the ceramic guide 3 at the other end, and presses the energizing tip 9a against the welding wire 1. A spring 10a is attached. The hot wire body 6 is provided with an energizing tip 9a, one end of which is supported on the outer surface and the other end of which is in contact with the additional wire 2, and a spring 10b for pressing the energizing tip 9a against the additional wire 2. The current-carrying tip 9a contacts the welding wire 1 at the tip of the ceramic guide 3 to supply power. On the other hand, the current-carrying tip 3b contacts the addition wire 2 through the opening 6b near the step where the front end of the hot wire body 6 and the step of the ceramic guide body 3a are in contact with each other, and conducts electricity. The power supply position of each current-carrying tip is not limited to the above position, but it is preferable that the welding wire 1 is a base metal near the tip of the ceramic guide, and that the addition wire 2 is a hot wire and is supplied with electricity at a high temperature. In order to heat, a position appropriately separated from the base material is good, and the opening hole 6b may be on the body 6 side or the ceramic guide 3 side.

Next, the operation of the hot wire GMA welding torch configured as described above will be described. The GMA wire 1 enters the shield nozzle 11 from the cable 7 in the outer cylinder 20 of the torch, and is formed by the guide hole 5 a formed in the GMA body 5, the V groove 17 of the ceramic guide 3, and the inner surface of the GMA body 5. Through the triangular hole (17) formed by the V-groove 17 of the ceramic guide 3a and the inner surface of the GMA holding plate 3b. During this time, an arc is generated, melted by the arc, and supplied to the molten pool of the base material. The arc current flows through the wire 1 via the cable 7, the GMA body 5, and the conducting tip 9a, and generates an arc with a base material (not shown) to form a molten pool.

On the other hand, the hot wire 2 passes through the cable 8 and the round hole 6a in the hot wire body 6, and comes into contact with the current-carrying chip 9b, after which the V-groove 18 of the ceramic guide body 3a and the pressing plate 3c Through the triangular hole (18), which is formed by the arc, and reaches the molten pool on the base material formed by the arc. FIG. 3 shows a contact state between the hot wire 2 and the conducting tip 9b, and a cross-sectional shape of the triangular groove 17 for guiding the welding wire 1. The hot wire conducting tip 9b is pressed by a spring 10b such that one end thereof contacts the hot wire body 6 and the other end thereof contacts the hot wire 2. Therefore, the heating current for the hot wire flows into the wire 2 via the cable 8, the body 6 for the hot wire, and the conducting tip 9b, and flows to the base material. The hot wire 2 is heated by Joule heat between the current-carrying tip 9b and the base material, and the temperature rises near the base material to near the melting point. At the exit of the triangular hole of the ceramic guide 3, the temperature has sufficiently reached the softening temperature. Therefore, even if the wire 2 has a bending habit, the wire 2 is straightened by a narrow triangular hole and straightened out.

In the above embodiment, the ceramic member 2 having the V grooves formed back to back is used. However, a torch for a hot wire GMA having a similar function can be used even if a ceramic member having two V grooves on one side is used. Can be configured.

In the above embodiment, two triangular holes are formed by combining the ceramic guide 3 having two V-grooves and the two ceramic flat plates 3b and 3c.
An integral ceramic member with a triangular hole can be substituted.
In this case, there is an advantage that the torch structure can be simplified and the size can be further reduced.

As described above, since the hot wire GMA welding torch supplies the welding wire 1 and the hot wire 2 from one torch, it is compact and easy to use.

Since the current-carrying tips 9a and 9b are substantially plate-shaped and have a structure pressed by a spring, they can be used even if the contact portion with the wire is considerably worn, and has a long life. The weight is reduced to about 1/5 as compared with the conventional tubular current-carrying tip, so that the material cost is low, and since the shape is simple and can be easily manufactured by forging, the manufacturing cost is halved, and the cost of consumable parts is low. I was able to finish.

In the conventional tip in GMA welding, an instantaneous arc break often occurs, and a large amount of spatter occurs when subsequently re-igniting. However, according to the torch of the present invention, the current-carrying tip is Since the current is kept in contact with the wire at all times, the generation of spatter due to the breakage and re-ignition of the arc is eliminated, and the effect that the total amount of spatter is drastically reduced is produced. In addition, since the contact conductivity is extremely good, occurrence of arc start mistake, which has been a problem particularly in unmanned welding lines, has been almost eliminated.

Regarding the GMA welding arc, the lateral movement of the wire is restrained by using a narrow triangular hole formed of a ceramic member. Disappeared and did not change over time. Since the position fluctuation at the wire 1 delivery point from the welding torch is restrained to be smaller and the wire inclination at the wire 1 delivery point is restrained to be smaller, the positional displacement of the tip of the wire 1 is smaller than the conventional one. / 2 or so. At the same time, it is no longer necessary to impart a bending habit to the welding wire 1 in order to ensure electrical conductivity, so that the wire 1 can be straightened and fed. Thus, in most cases, the problems of the generation of meandering beads during GMA welding and the misalignment of the aiming arc can be solved.

Since the ceramic guide 3 for guiding the wires 1 and 2 is made of a ceramic having excellent wear resistance such as silicon nitride, it is somewhat expensive, but is a quasi-consumable which hardly wears, and is replaced daily. Is unnecessary. Since the wires 1 and 2 are guided by the triangular holes having many gaps, no clogging occurs in the triangular holes.

As for the torch on the hot wire side, the bending tendency of the wire is corrected and straightened when the addition wire 2 that has been heated and softened by passing through the narrow triangular hole comes out, so that the position of the tip of the wire does not fluctuate. Was. For this reason, the positional relationship between the hot wire and the GMA arc has been maintained more constant, and the hot wire GMA welding itself has been performed extremely stably.

As described above, the torch according to the present invention solves the basic problem of the current-carrying tip in the conventional GMA welding, and greatly improves the performance of hot wire GMA welding. This produces a great effect.

[0034]

According to the present invention, the hot wire can be added from inside the shield nozzle of the GMA torch, and the torch is greatly reduced in size and is easy to use. In addition, the current-carrying tip has a structure that is held down by a spring, so even if it wears, it always contacts the wire and keeps current flowing, so there is no arc interruption and no spatter due to re-ignition after the arc is eliminated. And the total amount of spatter during welding is reduced.

The narrow triangular hole formed in the ceramic member restrains the movement of the wire in the lateral direction, thereby reducing the position fluctuation at the wire sending point from the welding torch, and making the arc aiming accurate. Also, since the triangular hole has a large gap, clogging by foreign matter in the ceramic guide portion does not occur.

Further, since the hot wire is heated by heating and softened and passes through a narrow triangular hole, the bending habit of the wire is corrected and straightened, and the wire tip position does not fluctuate. The positional relationship between the arcs is kept more constant, and the hot wire GMA welding itself can be performed extremely stably.

[Brief description of the drawings]

FIG. 1 is a hot wire GMA according to an embodiment of the present invention.
It is sectional drawing which shows the structure of the torch front part for welding.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a diagram illustrating a configuration of a typical hot wire GMA welding apparatus of the related art.

FIG. 5 is a view for explaining a torch around which two torches of a GMA welding torch and a hot wire supply torch are connected as a conventional example.

FIG. 6 is a view showing a structure of a hot wire GMA welding torch for supplying a GMA welding wire and a hot wire with one torch as a conventional example.

[Explanation of symbols]

 Reference Signs List 1 wire for GMA 2 additive wire 3 ceramic guide 3a ceramic guide main body 3b holding plate for GMA 3c holding plate for hot wire 5 body for GMA 5a round hole 6 body for hot wire 6a round hole 6b opening hole 7 conduit cable for GMA 8 hot Wire conduit cable 9a, b Current tip 10a, b Press spring 11 Shield nozzle 12 Shield gas hole 17 GMA wire guide groove 18 Hot wire guide groove 19 Holding block 20 Torch outer cylinder 21 GMA welding power supply 22 Hot wire heating power supply 23 Wire feeder 24 Hot wire feeder 25 Welding torch 26 Hot wire supply torch 27 Cable for arc current supply 28 Cable for wire heating current 29 Earth side supply cable 30 Conduit cable 1 conduit cable 32 base material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiharu Nagashima 5-3 Takaracho, Kure-shi, Hiroshima F-term in Bab Hitachi Industrial Co., Ltd. (reference) 4E001 LH01 MB10

Claims (2)

[Claims] 1. A first conduit cable integrally incorporating a welding wire conduit, an energizing cable and a shielding gas hose from a rear portion of a cylindrical body, and a second conduit cable integrally incorporating an adding wire conduit and another energizing cable. In the hot wire GMA welding torch for performing welding by sending out a welding wire and an additional wire together with a shielding gas from the front portion, and connecting the current-carrying cable to the front portion of the cylinder, guiding the welding wire. A first conductor having a hole, a second conductor having a hole connected to the another current-carrying cable and guiding the addition wire, and the welding wire attached to a front portion of the first and second conductors; An insulating ceramic guide having two triangular holes for guiding the addition wire, one end supported by the first conductor and the other end forward; A first energizing tip contacting the front end portion of the welding wire, a first spring member for pressing the first energizing chip to the welding wire,
One end is supported by the second conductor body and the other end is connected to the second conductor body.
A second current-carrying tip contacting the addition wire from an opening hole provided at a boundary between the conductor and the ceramic guide; and a second spring member for pressing the second current-carrying tip against the addition wire. Hot wire GM characterized by the following
A torch for welding. 2. The hot wire GMA welding torch according to claim 1, wherein the opening is provided on the first conductor side or the ceramic guide side.