KR20200002531U - Welding torch and arc welding robot - Google Patents

Abstract

To the first plate 40 made of non-ferrous metal, a steel joining auxiliary member 30 having an external shape having a shaft portion 31 and a flange portion and having a step is fitted or fixed, and the first plate 40 ) And the second plate 50 of steel are a welding torch for arc welding the second plate 50 and the joining auxiliary member 30 with respect to the plate set in which the second plate 50 overlaps each other, and the welding torch is the joining auxiliary member 30 ) And the nozzle 15 for pressing the first plate 40 toward the second plate 50 through the bonding auxiliary member 30, and the axial end 15e of the nozzle 15 Is provided with a pressing portion 15p for pressing the upper surface of the flange portion, and a projection 15d facing the outer circumferential surface of the flange portion from the outer diameter side of the pressing portion 15p, and the axial length of the projection 15d is It is shorter than the thickness of the flange part.

Description

Welding torch and arc welding robot {WELDING TORCH AND ARC WELDING ROBOT}

The present invention relates to a welding torch and an arc welding robot for joining dissimilar materials by welding.

Conventionally, as a technique for bonding dissimilar materials by welding, for example, a technique of bonding an aluminum alloy material (non-ferrous metal) and a steel material is disclosed in Patent Document 1, for example. In this technology, when joining an aluminum alloy material and a steel material, a through hole is provided in the aluminum alloy material, and a cylindrical washer with a flange formed at one end is inserted into the through hole, and the outer periphery of the washer is used as the nozzle tip. Arc welding is carried out by an electrode disposed inside the washer while pressing. That is, welding is performed between a steel washer and a steel material, thereby preventing the formation of an intermetallic compound due to dissimilar bonding between the aluminum alloy material and the steel material, and performing bonding in which a high metal bonding force is obtained.

U.S. Patent No. 3095951

Here, the structure of the nozzle tip portion disclosed in Patent Document 1 has a stepped structure comprising a portion pressing the upper end surface of the flange of the washer and a protruding portion positioned on the outer peripheral side of the outer peripheral surface of the flange. With such a stepped structure, when the washer is pressed, the protruding portion (the tip end surface of the nozzle) is designed to come into contact with the upper aluminum alloy material as the first member (see Fig. 3 of Patent Document 1).

For this reason, due to fluctuations in the plate thickness of the washer, for example, when the plate thickness of the washer is shorter than the length in the axial direction of the protruding portion, the washer cannot be sufficiently pressed and the washer rattles, resulting in welding failure.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a welding torch and arc welding robot capable of joining a non-ferrous metal and a dissimilar material of a steel material with a strong and reliable quality.

The above object of the present invention is achieved by the configuration of the following (1) according to the welding torch.

(1) A steel joining auxiliary member having an external shape having an end and a shaft portion and a flange portion is fitted or fixed to a first plate made of non-ferrous metal, and the first plate and the second plate of steel are With respect to the set of overlapping plates, it is a welding torch for arc welding the second plate and the bonding auxiliary member, and the welding torch is in contact with the bonding auxiliary member, and the first plate through the bonding auxiliary member And, a nozzle capable of pressing toward the second plate, and an axial end of the nozzle includes a pressing portion for pressing an upper surface of the flange portion, and a protrusion facing an outer circumferential surface of the flange portion from an outer diameter side of the pressing portion. And a length of the protrusion in the axial direction is shorter than a thickness of the flange.

A preferred embodiment of the present invention according to a welding torch relates to the following (2) to (9).

(2) The welding torch according to (1), wherein the protrusion has an axial length of 0.2 mm or more.

(3) When the inner diameter of the protrusion is Dn and the outer diameter of the flange is De,

The welding torch according to (1) or (2), which satisfies De≦Dn≦De+2.0 mm.

(4) When the inner diameter of the compression part is Dn' and the outer diameter of the flange part is De,

The welding torch according to any one of (1) to (3), which satisfies 7 mm≦Dn'<De.

(5) The welding torch according to any one of (1) to (4), wherein the nozzle has a notch from the axial end to the base end side or a hole in the side surface of the nozzle.

(6) The welding torch according to any one of (1) to (5), wherein the inner circumferential surface of the protrusion is an inclined surface whose diameter is enlarged toward the tip end of the nozzle.

(7) The welding torch according to any one of (1) to (6), wherein an axial end of the nozzle is a tapered shape whose diameter is reduced toward the tip end of the nozzle.

(8) The welding torch according to any one of (1) to (7), wherein an axial end of the nozzle is continuous in the circumferential direction of the nozzle.

(9) When the distance from the front end of the contact tip provided in the welding torch to the pressing part of the nozzle is Ex, the thickness of the flange is t, and the thickness of the first plate is T,

The welding torch according to any one of (1) to (8), which satisfies Ex≥5mm and Ex+t+T≤20mm.

In addition, the object of the present invention is achieved by the configuration of the following (10) according to the arc welding robot.

(10) An arc welding robot comprising the welding torch according to any one of (1) to (9) above.

According to the present invention, when the nozzle presses the flange portion of the joining auxiliary member by the pressing portion, the protruding portion located on the outer circumferential side of the flange portion does not contact the first plate (non-ferrous metal). As a result, since the pressing force of the nozzle is transmitted only through the bonding auxiliary member, the bonding auxiliary member, the first plate (non-ferrous metal), and the three members of the second plate (steel) are kept in a reliably close state in the plate thickness direction. . Therefore, since the close contact state of the three members is guaranteed, it is possible to provide a welding torch capable of joining the different materials between the first plate (non-ferrous metal) and the second plate (steel) with a solid and reliable quality.

1 is a schematic diagram showing an arc welding robot using a welding torch according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a welding torch used in the arc welding robot shown in FIG. 1.
3 is a perspective view and a cross-sectional view of a bonding auxiliary member.
4 is a perspective view showing a nozzle, a bonding auxiliary member, and a bonding member of the welding torch according to the first embodiment.
5A is a cross-sectional view of essential portions of a nozzle, a joining auxiliary member, and a joining member during arc welding in the case of using the welding torch according to the first embodiment.
Fig. 5B is an enlarged cross-sectional view of portion X in Fig. 5A.
Fig. 6 is a cross-sectional view of a welding portion showing a state after welding of the joining auxiliary member and the joining member according to the first embodiment.
7 is an enlarged cross-sectional view of a main part of a nozzle according to a second embodiment of the present invention.
8A is a perspective view of a main part of a third embodiment of the present invention.
Fig. 8B is a perspective view of a main part showing a modified example of the third embodiment of the present invention.
9 is a cross-sectional view of essential parts of a nozzle, a bonding auxiliary member, and a bonding member according to a fourth embodiment of the present invention.

[First embodiment]

Hereinafter, a welding torch and an arc welding robot according to a first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6. In addition, in this embodiment, as an example of a welding torch, a case where it is adapted to an arc welding robot (hereinafter, also simply referred to as "welding robot") using a welding gas shielded arc welding method will be described. However, the welding torch according to the present invention is not limited to the case where automatic welding is performed by the welding robot provided at the tip of the welding robot, for example, when it is held in the hand of the operator and semi-automatic welding is performed by the operator Also applicable to

An example of the configuration of the welding robot 1 applied to the present embodiment will be described with reference to FIG. 1. As shown in Fig. 1, the welding robot 1 includes a wire pack 2, a conduit cable 3, a wire feeding device 4, a welding power supply 5, a manipulator 6, and a welding torch 10. It is configured with.

<Wire Pack>

As shown in FIG. 1, the wire pack 2 is a supply source of welding wire WR, and a predetermined amount of welding wire WR is stored. As the welding wire WR, for example, a copper plated wire, a copper plated wire, a copper plated wire (SE wire), or the like can be used. Further, when the welding torch 10 according to the present embodiment is used in semi-automatic welding, a spool wire can be used.

<Conduit cable>

The conduit cable 3 (torch cable) welds a welding current supplied from the welding power source 5, a welding wire WR stored in the wire pack 2, and a shield gas stored in a shield gas storage means (not shown). It is to supply to the torch 10. The conduit cable 3 has one end connected to the wire feeding device 4 and the other end connected to the welding torch 10.

<Wire feeding device>

The wire feeding device 4 feeds the welding wire WR through the conduit cable 3 by a roller or the like, and feeds the welding wire WR to the welding torch 10 through the cable. The welding robot 1 can automatically supply the welding wire WR to the welding torch 10 by providing this wire feeding device 4.

<Welding power supply>

The welding power supply 5 is a source of welding current, and supplies welding current to the welding torch 10 through the wire feeding device 4 and the conduit cable 3. In addition, at one end (the lower plate 50 side in this embodiment) of the first plate 40 (hereinafter also referred to as ``upper plate'') and the second plate 50 (hereinafter also referred to as ``lower plate'') as the object to be welded, A power supply cable extending from the welding power supply 5 is connected.

<Manipulator>

The manipulator 6 is an articulated robot that supports the welding torch 10. This manipulator 6 is operated and controlled through a control device 8 such as a computer installed in a remote place, for example, and welding work can be performed on behalf of an operator.

<Welding torch>

The welding torch 10 is provided with a torch barrel 14 and a nozzle 15 as shown in FIG. 2, and the welding wire WR is automatically supplied into the barrel, and arc welding is performed using the welding wire WR. I can. The welding torch 10 is equipped with an energized metal member 11, a torch clamp 12 and a rubber cover 13. The energized metal member 11 is for passing a weak current to the nozzle 15 used to detect contact between the nozzle 15 and the object to be welded. The torch clamp 12 fixes the welding torch 10 to the manipulator 6. The rubber cover 13 is for protecting the connection part between the welding torch 10 and the conduit cable 3.

<Torch barrel>

The torch barrel 14 is supported by the torch clamp 12 and is provided with a mechanism for supporting the nozzle 15 and the chip body 18. More specifically, the chip body 18 is screwed to the inner surface of the tip of the torch barrel 14 having a cylindrical shape, and the contact tip 17 of the hollow cylindrical shape is screwed to the inner surface of the tip of the chip body 18 Has been. On the front end side of the torch barrel 14, a hollow cylindrical nozzle 15 is screwed coaxially with the chip body 18 and the contact tip 17. That is, on the front end side of the torch barrel 14, the nozzle 15 surrounds the chip body 18 and the contact tip 17, and the axial end in contact with the bonding auxiliary member 30 described later ( 15e) is provided and a welding space is formed. On the rear end side of the torch barrel 14, a conduit cable connecting portion 19 connected to the conduit cable 3 is formed.

The torch barrel 14 supplies the welding wire WR supplied from the conduit cable 3 to the contact tip 17 through an inner tube (not shown) in the chip body 18, and the contact tip 17 It is projecting from Further, the torch barrel 14 conducts a welding current through the conduit cable connection portion 19 to the conductive chip body 18, and passes through the space formed between the inner tube and the chip body 18 to pass the nozzle (15) Supply shield gas inside. Further, the orifice 16 has a mechanism for rectifying the shield gas.

<Contact Tips>

The contact tip 17 is provided with a mechanism for supplying a welding current to the welding wire WR and supplying the welding wire WR to the object to be welded. The contact tip 17 is formed of a conductive material such as metal.

Further, the contact tip 17 has an elongated tubular shape whose inner diameter is slightly larger than the outer diameter of the welding wire WR, and the outer diameter is formed to be small toward the tip end direction. The welding wire WR sent from the chip body 18 side through the inner tube can slide in the inner space while in contact with the inner peripheral surface of the contact tip 17. Thereby, the contact tip 17 can supply the welding wire WR to the object to be welded. Further, since the welding wire WR is sent in contact with the inner peripheral surface of the contact tip 17, the contact tip 17 can supply the welding current supplied from the chip body 18 side to the welding wire WR through the inner surface.

<Joining auxiliary member>

In FIG. 3, a perspective view (upper side of FIG. 3) and a cross-sectional view (lower side of FIG. 3) of the bonding auxiliary member 30 used in the present embodiment are shown. As shown in Fig. 3, the steel joining auxiliary member 30 has a shaft portion 31 having a small diameter and inserted into the object to be welded, and a flange portion 32 having a larger diameter than the shaft portion 31 coaxially continuous. It has an external shape provided with a step. Further, in the bonding auxiliary member 30, a hollow portion 33 penetrating the shaft portion 31 and the flange portion 32 is formed.

Further, the material of the steel joining auxiliary member 30 is not particularly limited as long as it is pure iron or an iron alloy, and examples thereof include mild steel, carbon steel, stainless steel, and the like.

<Nozzle>

The nozzle 15 is a cylindrical member provided on the tip side of the torch barrel 14. Further, the nozzle 15 is provided with a mechanism for ejecting shielding gas such as argon (Ar) or carbon dioxide (CO ₂ ) supplied from a gas supply device (not shown) to the object to be welded. The nozzle 15 has a function of blocking the welded portion from outside air using the shield gas rectified by the orifice 16. Thereby, the nozzle 15 prevents welding defects (blow holes) due to penetration of nitrogen in the atmosphere into the object to be welded.

As shown in Figs. 2 and 4, the nozzle 15 has two cutouts 15h from the axial end 15e of the nozzle 15 toward the base end 15b side. That is, the two leg portions 15f are formed by the cutouts 15h formed at opposite positions in the nozzle circumferential direction. This leg 15f can push the axial end 15e to the flange part 32 of the joining auxiliary member 30 (refer FIG. 5A) by driving the welding robot 1 suitably.

As shown in Fig. 5A, the axial end portion 15e, which is the tip portion of the leg portion 15f, has a pressing portion 15p constituting a plane toward the tip side, and a nozzle diameter direction than the pressing portion 15p. It has a protrusion 15d protruding from the outside in the tip direction. That is, the axial end 15e of the nozzle 15 is a pressing portion 15p that presses the upper surface 32u of the flange portion 32 of the bonding auxiliary member 30 as shown enlarged in FIG. 5B. Wow, it is provided with a stepped structure comprising a protruding portion 15d having a protruding inner surface 15ds facing the outer peripheral surface 32s of the flange portion 32 from the outer diameter side of the pressing portion 15p.

Further, the protruding portion 15d is configured such that its axial length h is shorter than the thickness t of the flange portion 32 (see Fig. 5A). That is, in a state in which the pressing portion 15p abuts the upper surface 32u of the flange portion 32, the tip surface 15dm of the protruding portion 15d does not contact the upper surface 40u of the upper plate 40. .

Here, it is preferable that the axial length h of the protrusion 15d is 0.2 mm or more. If the axial length h of the protrusion 15d is less than 0.2 mm, there is a fear that the protrusion 15d may not be reliably engaged with the flange 32 of the joining auxiliary member 30.

Further, as shown in Fig. 5A, when the inner diameter of the protrusion 15d is Dn and the outer diameter of the flange 32 is De, it is preferable to satisfy the relational expression of De≦Dn≦De+2.0 mm. If the inner diameter Dn of the protruding portion 15d is more than 2.0 mm than the outer diameter De of the flange portion 32, the displacement of the position of the nozzle 15 in the radial direction may increase, thereby causing welding failure. In addition, the configuration is considered so that it is easy to press the flange portion 32 by the protruding portion 15d and the precision of the pressing position can be improved.

In addition, as shown in Fig. 5A, when the inner diameter of the pressing portion 15p is Dn' and the outer diameter of the flange 32 is De, it is preferable to satisfy a relational expression of 7 mm≦Dn'<De. If Dn' is less than 7 mm, there is a fear that the nozzle 15 may not be in contact with the welding arc EA and the welding metal 70 (see Fig. 6) by securing the inner diameter dimension of the nozzle 15 to a predetermined or more. Further, if Dn' is greater than or equal to De, the pressing portion 15p cannot press the flange portion 32.

In addition, as shown in Fig. 5A, the distance from the tip portion 17e of the contact tip 17 to the pressing portion 15p of the nozzle 15 is Ex, the thickness of the flange 32 is t, and the first plate 40 When the thickness of is T, it is preferable to satisfy Ex≥5mm and Ex+t+T≤20mm. If Ex is less than 5 mm, there is a concern that the contact tip 17 comes into contact with the excess deposit Wa (see Fig. 6) formed by the welding arc EA. In addition, when Ex+t+T exceeds 20 mm, there is a fear that the size of the displacement of the center of the welding position due to the bending tendency of the welding wire WR exceeds 2.0 mm, resulting in a reduction in welding quality. That is, the space size on the lower side of the distal end 17e of the contact tip 17 is configured in consideration of the relationship with the size of the excess deposit Wa formed by the welding arc EA.

Next, an arc welding process using the above-described welding torch 10 will be described with reference to FIGS. 4 to 6.

First, as shown in FIG. 4, the upper plate 40 is provided with a hole 41 (see FIG. 6) that penetrates in the thickness direction and faces the overlapping surface of the lower plate 50. And as shown in Figure 4, the shaft portion 31 of the bonding auxiliary member 30 is inserted into the hole 41, the bonding auxiliary member 30, the upper plate 40, and the lower plate 50 are overlapped with each other to set the plate Is composed.

Next, by means of the control device 8, the welding torch 10 is moved three-dimensionally through the manipulator 6 of the welding robot 1, and as shown in Fig. 5A, the axis of the nozzle 15 The flange portion 32 of the joining auxiliary member 30 is pushed toward the top plate 40 by the direction end 15e.

At this time, as shown in FIG. 5B, the pressing portion 15p abuts against the flange portion 32 of the bonding auxiliary member 30. On the other hand, the front end surface 15dm of the protrusion 15d is separated from the upper surface 40u of the upper plate 40. Therefore, the pressing force F (refer to FIG. 5A) by the nozzle 15 is applied to the upper plate 40 and the lower plate 50 through the joining auxiliary member 30, so that the joining auxiliary member 30 and the upper plate 40 are plate sets. And the lower plate 50 is kept in close contact.

After that, the nozzle 15 supplies the shield gas SG into the nozzle 15 in a state where the bonding auxiliary member 30 is pressed, and the welding wire WR is attached to the bonding auxiliary member 30 by the wire feeding device 4. The welding wire WR protruding from the distal end of the contact tip 17 is supplied into the hollow portion 33 of FIG. As a result, arc discharge EA is generated, and shield gas SG flows around the arc discharge EA to perform welding type gas shield arc welding. At this time, the supplied shield gas SG leaks to the outside through the cutout 15h.

In addition, in this case, the inside of the hollow part 33 of the joining auxiliary member 30 is filled with a filler material (welding material). In general, the target position of the filler wire does not need to be moved, and the arc is cut off after an appropriate feeding time. End welding.

As described above, the hollow part 33 of the joining auxiliary member 30 is filled with the weld metal 70 of iron alloy or Ni alloy, in which the filler material is melted by arc welding, and the weld metal 70 and the melt. The formed melting portion W having an excess deposit Wa on the surface is formed by a portion of the lower plate 50 and the bonding auxiliary member 30 that has been formed. As shown in FIG. 6, the weld metal 70 is cooled and solidified, and the upper plate 40 and the lower plate 50 are firmly bonded through the joining auxiliary member 30 to form a dissimilar welding joint 60.

As described above, according to the welding torch 10 of the present embodiment, when the nozzle 15 presses the flange portion 32 of the joining auxiliary member 30 by the pressing portion 15p, the flange portion 32 ), the protrusions 15d located on the outer circumferential side do not contact the upper plate 40. Thereby, since the pressing force of the nozzle 15 is transmitted only by the contact between the pressing portion 15p and the bonding auxiliary member 30, the bonding auxiliary member 30, the upper plate 40, and the lower plate 50 The three members are firmly kept in close contact in the thickness direction of the plate. As a result, it is not necessary to provide a separate pressing means, and the adhesion of the three members is guaranteed, and the different materials of the upper plate 40 (non-ferrous metal) and the lower plate 50 (steel) can be joined with a strong and reliable quality. Welding torch can be provided.

In the present embodiment, since the axial length h of the protruding portion 15d is formed to be 0.2 mm or more, the difference between the pressing portion 15p and the outer periphery of the bonding auxiliary member 30 due to the step difference between the protruding portion 15d is Engagement is secured, and the bonding auxiliary member 30 can be accommodated inside the protrusion 15d. As a result, reliable pressure by the nozzle 15 can be performed, and good welding can be performed.

In the present embodiment, since the inner diameter Dn of the protruding portion 15d is not formed larger than the outer diameter De+2.0 mm of the flange portion 32, the positional displacement in the radial direction of the nozzle 15 can be reduced, thereby reducing the welding displacement. It can be made small and good welding can be performed.

In the present embodiment, by configuring the inner diameter Dn' of the pressing portion 15p to be 7 mm or more, it is possible to avoid the risk of the nozzle 15 coming into contact with the welding arc EA and the welding metal 70 during welding. Further, since the inner diameter Dn' of the pressing portion 15p is made smaller than the outer diameter De of the flange portion 32, the pressing of the flange portion 32 by the pressing portion 15p is reliably performed.

In the present embodiment, since the nozzle 15 has the cutout 15h at the axial end 15e, the shield gas SG can be discharged smoothly during welding, and the welded portion can be visually recognized.

In this embodiment, the distance from the distal end 17e of the contact tip 17 to the pressing portion 15p of the nozzle 15 is Ex, the thickness of the flange 32 is t, and the first plate 40 is When the thickness is T, since the distance Ex can be secured to 5 mm or more by satisfying Ex≥5mm and Ex+t+T≤20mm, the distal end 17e of the contact tip 17 is Contact with excess deposit Wa can be avoided, and good welding can be performed. As a result, it is excellent in strength and can perform satisfactory welding.

In addition, since the distance from the distal end 17e of the contact tip 17 to the surface 51 of the lower plate 50 is 20 mm or less, the size of the displacement of the center of the welding position due to the bending tendency of the welding wire WR is 2.0 It can be suppressed as small as mm or less, so that the welding quality can be improved.

In the present embodiment, the nozzle 15 is a protrusion 15d positioned on the outer circumferential side of the flange portion 32 when the flange portion 32 of the joining auxiliary member 30 is pressed by the pressing portion 15p. ) Does not contact the upper plate 40, the pressing force of the nozzle 15, the welding torch 10 capable of reliably holding the upper plate 40 and the lower plate 50 in the plate thickness direction through the bonding auxiliary member 30 ) Can be provided with an arc welding robot (1).

[Second Embodiment]

A second embodiment of the present invention will be described with reference to FIG. 7. 7 is an enlarged cross-sectional view of the end portion of the nozzle 15 in the axial direction. In addition, in this embodiment shown in FIG. 7, the same reference|symbol is attached|subjected to the same component as 1st embodiment, and description is abbreviate|omitted.

In this embodiment, the nozzle 15 of the welding torch 10 differs from the first embodiment in the shape of its axial end 15e. That is, the protruding portion 15d is formed of an inclined surface whose inner diameter is enlarged in diameter toward the tip end of the nozzle 15 with the protruding inner surface 15ds. In addition, in this embodiment, the outer peripheral surface 32s of the flange part 32 of the joining auxiliary member 30 is comprised by the inclined surface imitating the inclination of the protruding inner surface 15ds.

According to the present embodiment, since the protruding portion 15d has an inclined surface whose protruding inner surface 15ds is enlarged in diameter toward the tip end, when the nozzle 15 abuts the bonding auxiliary member 30, the nozzle 15 ) Can be corrected for displacement in the radial direction. That is, for example, in a state in which the axial end 15e of the nozzle 15 is displaced (displacement in the radial direction of the joining auxiliary member 30), the inner surface 15ds protruding from the flange 32 is formed. When abutting, a component force (a force in the radial direction) is generated by the inclination of the protruding inner surface 15ds based on the pressing force F, and the positional displacement is corrected. As a result, position alignment with the nozzle 15 and the bonding auxiliary member 30 can be performed, and good welding can be performed.

[Third embodiment]

A third embodiment of the present invention will be described with reference to Figs. 8A and 8B. 8A and 8B are enlarged perspective views of an end portion of the nozzle 15 in the axial direction. In addition, in the present embodiment shown in Figs. 8A and 8B, the same reference numerals are attached to the same components as in the first embodiment, and the description is omitted.

In the welding torch 10 of the first embodiment described above, the cutout 15h was formed at the axial end 15e of the nozzle 15, but in the present embodiment, a hole in the side surface 15j of the nozzle 15 (15i) is formed. That is, in the case of the structure shown in Fig. 8A, for example, two circular or elliptical holes 15i are provided at positions substantially facing each other. Accordingly, the axial end portion 15e is configured as a circular cross section 15c continuous in the circumferential direction of the nozzle.

The structure shown in Fig. 8B is a structure showing a modified example of the hole 15i shown in Fig. 8A, and for example, four rectangular holes 15i are provided.

According to this embodiment, not only has the same effect as the notch 15h in the first embodiment, but also the axial end 15e of the nozzle 15 is a circular cross section 15c continuous in the circumferential direction. Therefore, the strength of the tip portion of the nozzle 15 is improved, and the pressing force of the bonding auxiliary member 30 by the nozzle 15 can be increased.

[Fourth embodiment]

A fourth embodiment of the present invention will be described with reference to FIG. 9. 9 is an enlarged perspective view of an end portion in the axial direction of the nozzle. In addition, in this embodiment shown in FIG. 9, the same reference|symbol is attached|subjected to the same component as 1st embodiment, and description is abbreviate|omitted.

In the present embodiment, the welding torch 10 has a tapered shape in which the leg portion 15f of the nozzle 15 is reduced in diameter toward the tip end.

According to this embodiment, since the leg portion 15f of the nozzle 15 is tapered in diameter toward the tip end, the size of the axial end 15e of the nozzle 15 even when the bonding auxiliary member 30 is small It can be configured small by matching.

The present invention is not limited to the above-described embodiment, and modifications and improvements may be made as appropriate. In addition, the external shape of the flange part 32 is not limited to the circular shape as shown in FIG. 3, and can be made into any shape. In addition, the shape of the hollow portion 33 is not limited to a circular shape, and may be an arbitrary shape such as an ellipse or a polygon of more than a square.

In addition, although the outer peripheral surface 32s of the bonding auxiliary member 30 in 2nd Embodiment is comprised as a tapered surface, it does not necessarily need to be a tapered surface. In addition, the number of cutouts 15h or holes 15i in the above-described embodiment is not limited to two or three, and the shape is not limited to that shown at all.

Although the present invention has been described in detail and with reference to specific embodiments, it is clear to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.

This application is based on Japanese utility model application No. 2019-001671 for which it applied on May 13, 2019, The content is taken in here as a reference.

1: Welding robot (arc welding robot)
10: welding torch
15: nozzle
15d: protrusion
15ds: protruding inner surface
15e: axial end
15h: notch
15i: hole
15j: side part
15p: pressure part
17: contact tips
17e: tip
30: connection auxiliary member
31: shaft
32: flange portion
32s: outer peripheral surface
40: top plate (first plate)
50: lower plate (second edition)

Claims (10)

A plate in which a steel joining auxiliary member having an external shape having an end and a shaft portion and a flange portion is fitted or fixed to a first plate made of non-ferrous metal, and the first plate and the second plate made of steel overlap each other With respect to the set, it is a welding torch for arc welding the second plate and the joining auxiliary member,
The welding torch has a nozzle capable of pressing the first plate toward the second plate through the bonding auxiliary member while abutting the bonding auxiliary member,
The axial end of the nozzle includes a pressing portion for pressing the upper surface of the flange portion, and a protrusion facing the outer circumferential surface of the flange portion at an outer diameter side of the pressing portion,
A welding torch, wherein the protrusion has an axial length shorter than a thickness of the flange. The method of claim 1,
The axial length of the protrusion is 0.2 mm or more, welding torch. The method according to claim 1 or 2,
When the inner diameter of the protrusion is Dn and the outer diameter of the flange is De,
Welding torch satisfying De≤Dn≤De+2.0mm. The method according to claim 1 or 2,
When the inner diameter of the pressing portion is Dn' and the outer diameter of the flange portion is De,
Welding torch satisfying 7mm≤Dn'<De. The method according to claim 1 or 2,
The nozzle is a welding torch having a notch from the axial end to a base end side or a hole at a side surface of the nozzle. The method according to claim 1 or 2,
The inner circumferential surface of the protrusion is an inclined surface extending in diameter toward the tip end of the nozzle, a welding torch. The method according to claim 1 or 2,
A welding torch having a tapered shape in which an axial end of the nozzle is reduced in diameter toward a tip end of the nozzle. The method according to claim 1 or 2,
The welding torch, wherein the axial end of the nozzle is continuous in the circumferential direction of the nozzle. The method according to claim 1 or 2,
When the distance from the distal end of the contact tip provided in the welding torch to the pressing part of the nozzle is Ex, the thickness of the flange is t, and the thickness of the first plate is T,
Welding torch satisfying Ex≥5mm and Ex+t+T≤20mm. An arc welding robot comprising the welding torch according to claim 1 or 2.

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