JP2006289381A - Welding torch and welding method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding torch which can perform welding work in a place where an obstacle exists in the neighborhood of a welding line in the direction separating from the welding line on the side of the welding torch, for example, even in the welding line penetrating a welding line under a scallop in a steel structure. <P>SOLUTION: In the welding torch 1 which has a support angle 45, wire piping 47, shielding gas piping 49, a water supply pipe 51, and a water drain pipe 53 inserted into an outer pipe 29, and which has an upper tip holder 33 and a lower tip holder 35 arranged on the tip end of the outer pipe 29 so as to hold a tip 73 for performing the welding work, the outer pipe 29 is arranged so as to extend in one direction, and the upper tip holder 33 and the lower tip holder 35 are arranged such that their axes are bent with respect to the axis of the outer pipe 29. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a welding torch capable of performing welding in a narrower place and a welding method using the same.

Recently, it has been required that welding can be performed in a narrow place. As a welding torch for performing this, there is one disclosed in Patent Document 1, for example.
This is a device in which the outer diameter of the cylindrical nozzle is reduced by devising a structure for attaching the cylindrical nozzle for gas shield covering the chip holder to the main body. As a result, welding failure due to contact with the workpiece can be prevented and welding can be reliably performed even in a place where the cylindrical nozzle is narrow.

Utility Model Registration No. 30653327 (paragraphs [0006] to [0010] and FIG. 1)

  However, in the one shown in Patent Document 1, for example, a welding operation is difficult in a narrow place where an obstacle surrounding the weld line exists, such as through welding a scalloped weld line in a steel structure. was there.

  In view of the above problems, the present invention is a welding line penetrating through a scalloped welding line in a place where there is an obstacle close to the welding torch in the direction away from the welding line, for example, a steel structure. Another object of the present invention is to provide a welding torch capable of performing a welding operation and a welding method using the same.

In order to solve the above problems, the present invention employs the following means.
That is, the welding torch according to the present invention has a tip holder for holding a tip for performing welding work at the tip of the outer cylinder, with the welding current path, wire piping, shield gas piping and cooling water piping inserted into the outer cylinder. In the provided welding torch, the outer cylinder is provided to extend in one direction, and the tip holder is provided so that its axis is bent with respect to the axial direction of the outer cylinder. Features.

Thus, the outer cylinder of the welding torch is provided extending in one direction, and the tip holder is provided so that its axis is bent with respect to the axial direction of the outer cylinder. Even in a state where it is held horizontally, the tip can be positioned facing the welding line to perform the welding operation. In this state, since the welding along the weld line can be performed by moving the outer cylinder in a substantially horizontal direction, even in a place where there is an obstacle close to the direction away from the weld line on the welding torch side. Welding work can be performed.
Further, if welding is performed by moving the outer cylinder substantially horizontally in the axial direction, the welding operation can be performed even in a place where there is an obstacle in a direction perpendicular to the welding line. In this case, it is possible to perform welding so as to penetrate through the area surrounded by a hole or the like, and it is possible to perform welding in a narrow space where adjacent members exist at a narrow interval.
In addition, when the outer cylinder is long, for example, long distance welding can be performed even when it penetrates a hole.

The radius of curvature of the chip holder is preferably 30 to 100 mm. If the radius of curvature is less than 30 mm, the curvature is large and the wire may not be stably fed. On the other hand, if it exceeds 100 mm, the outer cylinder becomes unsuitable for welding work in a narrow space because the distance from the weld line becomes large during welding work.
Furthermore, the angle between the axis of the outer cylinder and the axis of the chip is preferably 30 to 90 °. If it is less than 30 °, when the outer cylinder is kept substantially horizontal, the tip tilt angle with respect to the welding line is shallow, arc destabilization, frequent spattering, convex welding bead, etc. occur, and sound welding cannot be performed. Further, if it exceeds 90 °, the bend is large and the wire may not be stably fed.

  In the welding torch according to the present invention, the welding current path is an angle type.

  Thus, since the welding current path is an angle type, the rigidity is increased. For this reason, since the welding current path can be made to function as a strength member of the welding torch by being engaged with the outer cylinder, the diameter of the outer cylinder can be reduced. If the diameter of the outer cylinder can be reduced, the distance from the weld line to the outside of the outer cylinder is shortened when welding, so that the welding operation can be performed in a narrower space.

  In the welding torch according to the present invention, the wire pipe, the shield gas pipe, and the cooling water pipe are attached to the welding current path to form an integrated pipe assembly.

Thus, since wire piping, shield gas piping, and cooling water piping are attached to the welding current path, they can be arranged compactly.
In addition, a welding torch can be assembled by attaching a pipe assembly that incorporates wire piping, shield gas piping, and cooling water piping to the outside of the welding current path to the outer cylinder. The assembly can be easily performed as compared with the case where the pipe, the cooling water pipe, and the welding current path are individually incorporated in the outer cylinder.

  In the welding torch according to the present invention, the tip holder is detachably attached to the outer cylinder.

  Thus, since the chip holder is detachably attached to the outer cylinder, it can be easily replaced. For this reason, an optimum welding operation can be performed in accordance with the target location by preparing a chip holder having chips having different curvatures or different properties and replacing them appropriately.

  In the welding torch according to the present invention, a plurality of the pipe assemblies are provided, and the tip holder is provided corresponding to each pipe assembly.

As described above, since a plurality of pipe assemblies are provided and the tip holder is provided corresponding to each pipe assembly, a plurality of weldings can be performed at the same time, and the efficiency of the welding operation can be improved.
Note that the plurality of tips may be arranged in a direction along the weld line, may be arranged in a direction orthogonal thereto, or may be arranged in an arbitrary angle direction inclined thereto.
In addition, if a plurality of holding members formed of an insulator are provided at intervals in the longitudinal direction of the outer cylinder and each pipe assembly is held at an interval, each pipe assembly is provided depending on the rigidity of the welding current path. Solids can be held in positions that do not touch each other. If it does in this way, since each pipe assembly does not mutually contact, it is not necessary to provide the holding member covering the full length of an outer cylinder, Therefore A welding torch can be manufactured cheaply.

  The welding method concerning this invention positions the welding torch in any one of Claim 1-5 so that the axial direction of the said outer cylinder may follow a weld line, and the said weld torch follows the said weld line The welding is performed by moving in the direction.

Thus, the welding torch is positioned so that the axial direction of the outer cylinder is along the welding line, and welding is performed by moving the welding torch in the direction along the welding line, so that the welding torch is orthogonal to the welding line. Welding work can be performed even in places where there are obstacles. That is, for example, welding can be performed where a weld line is provided through the hole, and welding can be performed in a narrow space where adjacent members exist at a narrow interval.
In addition, when a welding torch having a long outer cylinder is used, for example, when a hole is penetrated, a long distance welding can be performed.

  Further, the welding method according to the present invention is characterized in that a smoothing process is performed by plasma powder welding on an interposition portion of a weld bead formed by the welding torch.

  Thus, since the smoothing process is performed by plasma powder welding on the interposition part of the weld bead formed by the welding torch, the stress concentration at the interposition part can be relaxed.

  According to the present invention, a welding operation is performed even in a place where there is an obstacle in the direction away from the welding line on the welding torch side, for example, a welding line that penetrates the welding line under the scallop in the steel structure. It can be carried out.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.
FIG. 1 shows an elevated road 3 having a target part that utilizes a welding torch 1 according to the present embodiment. The elevated road 3 includes a large number of columns 7 erected on the ground 5 at intervals, a large number of beams 9 that are mounted substantially horizontally perpendicular to the upper positions of the columns 7, and upper portions of the beams 9. A main girder 11 provided continuously in the road extending direction and a road 13 provided above the main girder 11 are provided. (See Fig. 1 (a))
FIG. 1B shows a schematic joint structure between the column 7 and the beam 9. The web 15 is provided on both sides in the road extension direction, and the two column flanges 17 and the two beam flanges 19 are joined to the web 15 so as to connect the webs 15 on both sides to form a box structure. .

FIG.1 (c) expands and shows the corner | angular part 21 of FIG.1 (b). The corner portion 21 has a structure in which the web 15, the column flange 17, and the beam flange 19 that are orthogonal to each other are joined. A gap is provided between the beam flange 19 and the web 15 and the column flange 17, and a diaphragm 23 overlapped with the beam flange 19 is disposed in the gap, which is connected to the web 15 and the column flange 17. The corner portions 21 are formed by bonding.
In the diaphragm 23, a scallop 25 is posted at a joint portion (weld line) 27 between the web 15 and the column flange 17.

FIG. 3 shows a schematic configuration of the welding torch 1, and FIG. 4 shows a tip portion of the welding torch 1.
The welding torch 1 includes an outer cylinder 29, a shield nozzle 31, an upper tip holder (tip holder) 33, a lower tip holder (tip holder) 35, an upper tube assembly (tube assembly) 37, and a lower tube. An assembly (pipe assembly) 39, a guide roller 41, and an intermediate ring 43 are provided.
The outer cylinder 29 is made of stainless steel and has a cylindrical shape. The length is, for example, about 800 mm, the outer diameter is, for example, 45 mm, and the wall thickness is about 2 mm.

  The upper tube assembly 37 and the lower tube assembly 39 are arranged vertically when mounted, have a substantially pointed structure with respect to the axis center of the outer cylinder 29, and are provided with similar members. In the drawings, suffixes “a” and “b” are attached after the reference numerals to distinguish the upper tube assembly 37 and the lower tube assembly 39. “A” indicates a part or member of the upper pipe assembly 37, and “b” indicates a part or member of the lower pipe assembly 39. In the following description, when distinguishing the upper tube assembly 37 side and the lower tube assembly 39 side, a and b are added, but unless otherwise distinguished, a and b are omitted and only symbols are used. Each part and member shall be shown.

The upper pipe assembly 37 and the lower pipe assembly 39 include a support angle (welding current path) 45, a wire pipe 47, a shield gas pipe 49, a water supply pipe (cooling water pipe) 51, and a drain pipe (cooling water pipe). 53) (see FIG. 7).
The support angle 45 is made of copper and has a U-shaped cross section, and its length is, for example, about 1050 mm. The support angle 45 is supplied with current from a power source 56 at one end thereof.
The support angle 45 may be made of steel depending on circumstances.

The wire piping 47 is made of, for example, copper, and is fixed to the lower central portion of the support angle 45 by brazing, for example, over the substantially entire length along the longitudinal direction thereof. The wire pipe 47 guides the wire supplied by the wire supply device 58 from one end side thereof.
The shield gas pipe 49 is made of, for example, copper, and is fixed to the corner portion of the support angle 45 over the substantially entire length along the longitudinal direction thereof, for example, by brazing. The shield gas pipe 49 supplies the shield gas supplied from the gas cylinder 64 from one end side thereof. For example, argon gas is used as the shielding gas.

Each of the water supply pipe 51 and the drain pipe 53 is made of, for example, copper, and is fixed to the end of the support angle 45 by brazing, for example, over the substantially entire length along the longitudinal direction thereof. One end of the water supply pipe 51 is connected to the pump 60, and the drain pipe 53 is connected to the tank 62. The water supply pipe 51 is made of steel so as to circulate the cooling water stored in the tank 62.
One end of the outer cylinder 29 is fitted and fixed to the step portion 55 of the intermediate ring 43. A plurality of, for example, three retaining rings 59 are fixed to the outer cylinder 29 at intervals in the longitudinal direction.

As shown in FIG. 6, the intermediate ring 43 has a substantially cylindrical shape having stepped portions 55 and 57 at both ends, and holding passages 61 a and 61 b having a pentagonal cross section along the axis are the upper and lower surfaces. Is provided. A partition 65 is provided between the holding passage 61a and the holding passage 61b.
As shown in FIG. 8, the holding ring 59 has a substantially cylindrical shape, and is provided with holding passages 63 a and 63 b having a pentagonal cross section along the axis. A partition 67 is provided between the holding passage 63a and the holding passage 63b.
The intermediate ring 43 and the holding ring 59 are made of an electrically insulating material such as bakelite.

  The support angle 45 a of the upper pipe assembly 37 is held by the holding passage 61 a of the intermediate ring 43 and the holding passage 63 a of the holding ring 59. Further, the support angle 45 b of the lower pipe assembly 39 is held by the holding passage 61 b of the intermediate ring 43 and the holding passage 63 b of the holding ring 59. The support angle 45a and the support angle 45b are separated by a partition 65 in the intermediate ring 43 and separated by a partition 67 in the holding ring 59, and are spaced by the rigidity of the support angle 45 at a position between them. ing. That is, the support angle 45a and the support angle 45b are prevented from contacting each other and short-circuiting.

The upper tip holder 33 and the lower tip holder 35 are attached to the distal ends of the upper tube assembly 37 and the lower tube assembly 39, respectively. Accordingly, the upper chip holder 33 and the lower chip holder 35 are arranged one above the other and are provided with the same members. In the drawing, suffixes “a” and “b” are added after the reference numerals to indicate the upper chip holder 33. And the lower chip holder 35 will be distinguished. “A” indicates a part or member of the upper chip holder 33, and “b” indicates a part or member of the lower chip holder 35. In the following description, when distinguishing the upper chip holder 33 side and the lower chip holder 35 side, a and b are added, but unless otherwise distinguished, a and b are omitted. And members.
In the present embodiment, each member of the upper chip holder 33 and the lower chip holder 35 is disposed at the line target position, but may be provided in the same positional relationship in the vertical direction.

10 is a side view schematically showing the overall configuration of the upper chip holder 33, FIG. 11 is a ZZ sectional view of FIG. 10, and FIG. 5 is a cross-sectional view taken along the line XX of FIG. 4 when the upper chip holder 33 and the lower chip holder 35 are mounted.
The upper chip holder 33 and the lower chip holder 35 are provided with a holder main body 69, a flange portion 71, a chip 73, and a cooling water chamber 75.
The holder main body 69 is made of copper, has a pentagonal shape in which the upper cross section of the rectangular cross section is cut out, and is curved so as to have an appropriate curvature in the longitudinal direction.

The radius of curvature is, for example, 50 mm.
The radius of curvature is preferably 30 to 100 mm. If the radius of curvature is less than 30 mm, the curvature is large and the wire may not be stably fed. On the other hand, if it exceeds 100 mm, the distance from the weld line of the outer cylinder 29 increases during welding work, so the scallop 25 needs to be increased, and the strength of the steel structure may be reduced. Moreover, the processing amount of the scrap 25 will also increase.

The flange portion 71 is provided at one end of the holder main body 69 and has a widened portion 77 having bolt holes on both sides. By fixing the widened portion 77 to the end surface of the intermediate holder 43 with bolts, the upper chip holder 33 and the lower chip holder 35 are fixed to the intermediate ring 43.
The holder main body 69 and the flange portion 71 are provided with a wire passage 79, a shield gas passage 81, a water supply passage 83, and a drainage passage 85 in the longitudinal direction. The wire passage 79, the shield gas passage 81, the water supply passage 83, and the drain passage 85 are respectively connected to the wire pipe 47, the shield gas pipe 49, the water supply pipe 51, and the water supply pipe 51 when the upper tip holder 33 and the lower tip holder 35 are attached to the intermediate ring 43. An extension portion of the drain pipe 53 is formed.

A tip 73 for supplying a wire and a shielding gas is attached to the other end (tip) of the holder main body 69.
A cooling water chamber 75 is provided at the tip of the holder main body 69 so as to surround the chip 73 over a half circumference. A water supply passage 83 and a drainage passage 85 are communicated with the cooling water chamber 75.
As shown in FIG. 4, when the outer cylinder 29 is substantially horizontal, the angle α between the axis of the tip 73 and the horizontal line (ie, the weld line) is, for example, about 60 ° for the tip 73a and about 50 ° for the tip 73b. Has been.

The angle α is preferably 30 to 90 °. If it is less than 30 °, when the outer cylinder 29 is kept substantially horizontal, the inclination angle of the tip 73 with respect to the welding line 27 is shallow, and arc instability, frequent spattering, convex welding bead, etc. occur, and sound welding cannot be performed. . Further, if it exceeds 90 °, the bend is large and the wire may not be stably fed.
Also, a plurality of upper chip holders 33 and lower chip holders 35 are prepared such that the angle α falls within the range of 30 to 90 ° according to the assumed work.
Further, a chip 73 having a different groove is also prepared.

The shield nozzle 31 is a trumpet-shaped cylinder as shown in FIG. 9, and one end is fitted and attached to the outer periphery of the stepped portion 57 of the intermediate ring 43.
The shield nozzle 31 is installed so as to surround the upper chip holder 33 and the lower chip holder 35 as shown in FIG. 4, and prevents the shield gas from diffusing to the surroundings.
The shield nozzle 31 is prepared in various shapes according to the types of the upper chip holder 33 and the lower chip holder 35 to be used.

Upper blocks 87 a and 87 b serving as relay members for the respective pipes are provided at the ends of the upper pipe assembly 37 and the lower pipe assembly 39.
The guide roller 41 is provided so as to protrude from the outer periphery of the outer cylinder 29 so as to be orthogonal to the axial direction within a plane formed by the axis center of the outer cylinder 29 and the axis center of the chip 73.
A plurality of guide rollers 41 are provided at intervals in the longitudinal direction of the outer cylinder 29. When the guide roller 41 is moved along the weld line, the outer cylinder 29 is maintained substantially horizontal, and the tip end position of the tip 73 is the best position with respect to the weld line.

The operation of the welding torch 1 described above will be described including its actions and effects.
First, assembly of the welding torch 1 will be described.
An intermediate ring 43 is attached to the tip of the outer cylinder 29, and a holding ring 59 is attached to a predetermined position in the longitudinal direction of the outer cylinder 29.
In parallel with this, the wire pipe 47, the shield gas pipe 49, the water supply pipe 51, and the drain pipe 53 are fixedly attached to the support angle 45 to form the upper pipe assembly 37 and the lower pipe assembly 39.
Thus, since the wire pipe 47, the shield gas pipe 49, the water supply pipe 51, and the drain pipe 53 are attached to the support angle 45 having a U-shaped cross section, they can be arranged in a compact manner. Moreover, since it is attached in the place where it is easy to work close, work efficiency can be improved.

The upper tube assembly 37 and the lower tube assembly 39 assembled in this way are inserted into the holding passages 63a and 63b of the holding rings 59 of the outer cylinder 29, and further into the holding passages 61a and 61b of the intermediate ring 45, respectively. It is inserted and attached to the outer cylinder 29.
As described above, since the insertion work is performed once for each of the upper pipe assembly 37 and the lower pipe assembly 39, the support angle 45, the wire pipe 47, the shield gas pipe 49, the water supply pipe 51 and the drain pipe 53 are individually inserted. Compared to doing this, the work can be performed easily.

  Since the support angle 45 is an angle having a U-shaped cross section, the support angle 45 itself has high rigidity. The support angle 45 is engaged with the outer cylinder 29 via the holding ring 59 and the intermediate ring 45. Therefore, it functions as a strength member of the welding torch. For this reason, since the strength of the outer cylinder 29 can be omitted by the support angle 45, the diameter of the outer cylinder 29 can be reduced. If the diameter of the outer cylinder 29 can be reduced, the distance from the weld line to the outside of the outer cylinder 29 is shortened when welding, so that the welding operation can be performed in a narrower space.

  When the upper tube assembly 37 and the lower tube assembly 39 are held at a distance from each other by the plurality of holding rings 59 formed of an insulator, the support angle 45 is positioned so as not to contact each other due to its rigidity. Can be held. In this case, since each upper tube assembly 37 and lower tube assembly 39 are not in contact with each other, it is not necessary to provide a holding member over the entire length of the outer cylinder 29, so that the welding torch 1 is manufactured at a low cost. it can.

Next, the upper tip holder 33 and the lower tip holder 35 having a shape suitable for a welding operation to be performed are fixedly attached to the front end surface of the intermediate ring 45.
Then, the shield nozzle 31 suitable for the attached upper chip holder 33 and lower chip holder 35 is inserted so as to cover the periphery of the upper chip holder 33 and lower chip holder 35, and is fixed to the stepped portion 57 of the intermediate ring 45. Install.
Thus, since the upper chip holder 33 and the lower chip holder 35 are detachably attached to the outer cylinder, they can be easily replaced. For this reason, by preparing the upper chip holder 33 and the lower chip holder 35 having different curvatures or different properties and appropriately exchanging them, an optimum welding operation can be performed according to the target location.

  The support angle 45, the wire pipe 47, the shield gas pipe 49, the water supply pipe 51 and the drain pipe 53 of the welding torch 1 formed in this way are supplied with a power source 56, a wire supply device 58, a pump 60, a tank 62 and a gas cylinder 64. Connected to.

Next, the welding operation will be described.
As shown in FIG. 2, an operation of welding a weld line 27 between the web 15 provided through the scallop 25 provided in the diaphragm 23 and the column flange 17 will be described.
The guide roller 41 is brought into contact with the welding line 27 and the outer cylinder 29 of the welding torch 1 is set to a substantially horizontal posture. In this state, the welding torch 1 is inserted into the scallop 25 and the tip 73 is positioned at the welding work start position.
In this state, the cooling water is supplied from the pump 60 to the water supply pipe 51, and the cooling water is supplied to the cooling chamber 75 via the water supply passage 83. The cooling water passes through the drainage passage 85 and the drainage pipe 53, returns to the tank 62, and is repeated to circulate the cooling water.

Then, argon gas is jetted from the chip 73 through the shield gas pipe 49 and the shield gas passage 81 from the gas cylinder 64.
At the same time, a current and a wire are supplied from the power source 56 and the wire supply device 58 to start the welding operation.
At this time, the current from the power source 56 flows through the support angle 45, the wire pipe 47, the shield gas pipe 49, the water supply pipe 51, and the drain pipe 53 that are integrally formed of copper. As a result, these members are slightly heated due to resistance loss, but are cooled by the cooling water flowing through the water supply pipe 51 and the drain pipe 53 that are integrally made of steel. Absent.

The contact torch 1 is guided by the guide roller 41 that is in contact with the weld line 27, and the axial direction of the outer cylinder 29 is moved along the weld line 27 as indicated by an arrow 90 in FIG. That is, welding is performed by moving the welding torch 1 previously inserted into the scallop 25 so as to be pulled out. On the contrary, penetration welding can be performed by moving the welding torch 1 in the direction of insertion toward the scallop 25.
Along with this movement, the welding is first performed by the tip 73b along the welding line 27, and immediately thereafter, the welding is continued by the tip 73a.
In this way, two welding operations can be performed simultaneously by one movement of the welding torch 1, so that the efficiency of the welding operation can be improved.

When welding is performed as described above, as shown in FIG. 14, the interposition part 91 of the weld bead 89 may form a steep angle with respect to the base material. Thus, when the interposition part 91 forms a steep angle with respect to a base material, stress concentration will arise in the part.
In this case, in this embodiment, the smoothing process is performed on the interposition part 91 by plasma powder welding.
In the plasma powder welding, since the powder to be welded metal is introduced into the plasma arc formed at the tip of the nozzle via the inside of the torch, the supplementary bead 93 can be formed in such a manner that the target portion is supplemented. And the interposition part 95 formed by this can be made into the smooth inclination from a preform | base_material, and can prevent the possibility of making an undercut on the preform | base_material side.
Further, since plasma powder welding does not require a wire, it has good workability and can be easily applied to narrow portions.

In the present embodiment, the two tips 73 are arranged in the direction along the weld line 27, but the present invention is not limited to this, and the two chips 73 may be arranged in a direction orthogonal to the weld line 27. And may be arranged in an arbitrary angle direction inclined.
If it does in this way, a wide welding can be performed efficiently.

  Further, in this embodiment, since the obstacle is a scallop 25 that surrounds the welding line 27 in the vicinity, the axial direction of the welding torch 1 and the welding line 27 are moved in a matching direction. On the other hand, where there is no obstacle, the axial direction of the welding torch 1 may be positioned in a direction intersecting the welding line 27, and the welding operation may be performed in that state.

Furthermore, in this embodiment, although demonstrated as what was applied to the penetration welding of the scallop 25, it is not limited to this, In the narrow space in which an adjacent member exists at a narrow space | interval, for example, in a crossflow type windmill It is effective when applied to wing welding.
The present invention is applied to a narrow space and exhibits a great effect. However, the place of use is not limited thereto, and can be used even in a wide space.

It is a schematic block diagram which shows the elevated road to which the welding method of this invention is applied. It is a perspective view which shows the outline of the welding method of this invention. It is a side view showing the whole outline steel made of the welding torch concerning one embodiment of the present invention. It is a side view which shows a tip part of a welding torch concerning this embodiment partially fractured. It is XX sectional drawing of FIG. It is a perspective view which shows the intermediate ring concerning this embodiment. It is YY sectional drawing of FIG. It is a perspective view which shows the holding ring concerning this embodiment. It is a longitudinal cross-sectional view which shows the shield nozzle concerning this embodiment. It is a side view which shows the chip holder concerning this embodiment. It is ZZ sectional drawing of FIG. It is a B view of FIG. It is A view of FIG. It is sectional drawing which shows the state of a weld bead.

Explanation of symbols

1 welding torch 29 outer cylinder 33 upper tip holder 35 lower tip holder 37 upper tube assembly 39 lower tube assembly 45 support angle 47 wire piping 49 shield gas piping 51 water supply pipe 53 drainage pipe 73 tips 89 and 93 welding beads 91 and 95 Intersection

Claims (7)

In a welding torch in which a welding current path, wire piping, shield gas piping and cooling water piping are inserted into the outer cylinder, and a tip holder for holding a tip for performing welding work is provided at the tip of the outer cylinder,
The outer cylinder is provided extending in one direction,
The welding torch according to claim 1, wherein the tip holder is provided such that an axis thereof is bent with respect to an axial direction of the outer cylinder. The welding torch according to claim 1, wherein the welding current path is an angle type. The welding torch according to claim 2, wherein the wire pipe, the shield gas pipe, and the cooling water pipe are attached to the welding current path to form an integrated pipe assembly. The welding torch according to any one of claims 1 to 3, wherein the tip holder is detachably attached to the outer cylinder. The welding torch according to claim 4, wherein a plurality of the pipe assemblies are provided, and the tip holder is provided corresponding to each pipe assembly. The welding torch according to any one of claims 1 to 5 is positioned so that an axial direction of the outer cylinder is along the welding line, and welding is performed by moving the welding torch in a direction along the welding line. A welding method characterized by the above. The welding method according to claim 6, wherein a smoothing process is performed by plasma powder welding on an interposition portion of a weld bead formed by the welding torch.

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