WO2018074203A1

WO2018074203A1 - Welding torch

Info

Publication number: WO2018074203A1
Application number: PCT/JP2017/035780
Authority: WO
Inventors: 怜士玉城; 寿朗宮原
Original assignee: 株式会社ダイヘン
Priority date: 2016-10-19
Filing date: 2017-10-02
Publication date: 2018-04-26
Also published as: JPWO2018074203A1; JP7093304B2

Abstract

Provided is a welding torch with which leakage of a shielding gas can be suppressed while avoiding an increase in size. This welding torch is provided with: a wire feed tube including a wire feed passage through which a welding wire is fed; a contact tip attached to an end portion of the wire feed tube; and a tubular nozzle which is provided around the contact tip and through which a shielding gas flows. Separately from the wire feed passage, the wire feed tube also includes a gas supply passage which supplies the shielding gas to the nozzle.

Description

Welding torch

The present invention relates to a welding torch for performing welding.

The welding torch includes a cylindrical cover having an up-down direction as an axial direction, an inner side of a lower end of the cover, an insulated nozzle, and a contact tip provided inside the nozzle. A wire is inserted inside the cover and the contact tip, and the wire is delivered from the tip of the contact tip toward the welding location. A shield gas that suppresses the reaction between the molten metal and air is injected between the cover and the nozzle, and is sent toward the nozzle tip. By applying a voltage to the contact tip, an arc is generated between the contact tip and the object, and welding is performed. The shield gas covers the periphery of the arc and suppresses the occurrence of poor welding (see, for example, Patent Document 1).

The wire feed path through which the wire is fed is formed in the cover. In order to reduce the size of the welding torch, it is conceivable to use the wire feeding path as a shield gas flow path. For example, by providing a through hole in the peripheral surface of the wire feed path to connect the inner space of the wire feed path and the inner space of the nozzle, the shield gas passes through the wire feed path and the through hole, and the nozzle Released from.

JP 2004-237343 A

However, since the contact tip is provided at the end of the wire feed path, and the contact tip is provided with a hole through which the wire is sent, the shield gas leaks from the contact tip hole.

This invention is made | formed in view of such a situation, and it aims at providing the welding torch which can suppress the leakage of shielding gas, avoiding enlargement.

A welding torch according to the present invention is provided with a wire feeding cylinder having a wire feeding path for feeding a welding wire, a contact tip attached to an end of the wire feeding cylinder, and a periphery of the contact tip. The wire feeding cylinder has a gas supply path for supplying the shielding gas to the nozzle separately from the wire feeding path.

In the present invention, a single wire feeding cylinder is provided with a wire feeding path and a gas supply path.

The welding torch according to the present invention includes an outlet of the gas supply path formed on an outer peripheral surface of the wire feeding cylinder, and an outer fitting to the wire feeding cylinder to cover the outlet, and a plurality of through holes are provided. A cylindrical body arranged in a circumferential direction, wherein a first space is provided between the cylindrical body and the wire feeding cylinder, and the first space and a second space inside the nozzle are formed by the through hole. And communicate with each other.

In the present invention, by arranging a plurality of through-holes in the circumferential direction in the cylindrical body, the diameter of the through-holes can be reduced as compared with the case of providing a single large-diameter through-hole, and the pressure in the first space Can be increased. The shield gas is sent out radially from the plurality of through holes. As a result, shield gas with substantially the same flow rate is sent out radially from each through hole, and the periphery of the arc is stably covered with the shield gas, thereby suppressing the occurrence of poor welding.

In the welding torch according to the present invention, the wire feeding cylinder has a plurality of the gas supply paths, and a chamber connected to each of the plurality of gas supply paths is formed in the first space.

In the present invention, by forming a chamber connected to each of the plurality of gas supply paths in the first space, the volume of each chamber becomes smaller than that of the first space, so that the pressure in each chamber can be reduced to a desired pressure in a short time. Can be raised.

In the welding torch according to the present invention, the cylindrical body is screwed into the wire feeding cylinder.

In the present invention, it is possible to prevent the shielding gas from leaking from the first space by screwing the cylinder into the wire feeding cylinder. Further, the sealing degree in the first space is increased by the labyrinth effect of screwing, and the pressure in the first space is easily increased.

In the welding torch according to the present invention, the wire feed path and the gas supply path can be provided separately to suppress leakage of the shield gas. Moreover, the enlargement of the welding torch can be avoided by providing the wire feed path and the gas supply path in a single wire feed cylinder.

1 is an external perspective view schematically showing a welding torch. It is a longitudinal cross-sectional view of the welding torch which shows a gas supply path. It is a perspective sectional view of a welding torch showing a gas supply path. FIG. 4 is a perspective sectional view taken along line IV-IV in FIG. 2. FIG. 4 is a plan sectional view taken along line IV-IV in FIG. 2. It is a longitudinal cross-sectional view of the welding torch which shows a water channel. It is a perspective sectional view of a welding torch showing a water channel. It is the perspective view which visually recognized the opening-and-closing part from the upper part. It is the perspective view which visually recognized the opening-and-closing part from the lower part. It is a schematic longitudinal cross-sectional view of an opening / closing part. It is a partial expanded longitudinal cross-sectional view of the welding torch which shows the structure of the opening-closing part vicinity of the state where the water channel was open | released. FIG. 6 is a perspective sectional view taken along line XI-XI shown in FIG. FIG. 6 is a plan sectional view taken along line XI-XI shown in FIG. FIG. 6 is a perspective sectional view taken along line XII-XII shown in FIG. 5. FIG. 6 is a plan sectional view taken along line XII-XII shown in FIG. FIG. 6 is a perspective sectional view taken along line XIII-XIII shown in FIG. FIG. 6 is a plan sectional view taken along line XIII-XIII shown in FIG. FIG. 6 is a perspective sectional view taken along line XIV-XIV shown in FIG. 5. FIG. 6 is a plan sectional view taken along line XIV-XIV shown in FIG. 5. FIG. 6 is a perspective sectional view taken along line XV-XV shown in FIG. FIG. 6 is a plan sectional view taken along line XV-XV shown in FIG. It is a partial expanded longitudinal cross-sectional view of the welding torch which shows the structure of the opening-closing part vicinity of the state where the water channel was closed. FIG. 6 is a transverse sectional view schematically showing a first gas supply path to a fourth gas supply path. FIG. 5 is a cross-sectional view of an inner cylinder and a branch cylinder schematically showing the first chamber to the fourth chamber. It is a partial expanded longitudinal cross-sectional view which shows the state which screwed the branch cylinder to the inner cylinder.

Hereinafter, the present invention will be described with reference to the drawings showing a welding torch according to an embodiment. FIG. 1 is an external perspective view schematically showing a welding torch. In the following description, the top and bottom shown in the figure are used.

The welding torch includes a wire feeding cylinder 1 whose axial direction is the vertical direction for feeding a welding wire, and a cylindrical nozzle 4 into which a lower portion of the wire feeding cylinder 1 is inserted. The wire feeding cylinder 1 and the nozzle 4 are connected by a connecting cylinder 5. The wire feeding cylinder 1 and the nozzle 4 are arranged coaxially. A rectangular parallelepiped connecting portion 6 is provided at the upper end of the wire feeding tube 1.

A wire supply port 7 that supplies a wire, a water supply port 8 that supplies cooling water, a drain port 9 that discharges cooling water, and an air supply port 10 that supplies shield gas are connected to the connection portion 6. The wire supply port 7 has a cylindrical shape and is provided coaxially with the outer cylinder 2.

FIG. 2 is a longitudinal sectional view of the welding torch showing the gas supply path 11, and FIG. 3 is a perspective sectional view of the welding torch showing the gas supply path 11.

The wire feeding cylinder 1 includes an outer cylinder 2 and an inner cylinder 3 inserted into the outer cylinder 2. The lower end portion of the inner cylinder 3 protrudes below the outer cylinder 2 and is inserted into the nozzle 4. A wire feed path 1 a penetrating vertically is formed in the axial center portion of the inner cylinder 3. A contact chip 20 is inserted into the lower end portion of the inner cylinder 3. The contact chip 20 has a cylindrical shape extending in the axial direction, and is provided coaxially with the inner cylinder 3. The lower end portion of the contact chip 20 is located near the lower end portion of the nozzle 4.

The welding wire is supplied from the wire supply port 7 and is sent to the lower side of the nozzle 4 through the wire feed path 1 a and the contact tip 20.

As shown in FIGS. 2 and 3, a gas supply path 11 extending in the axial direction is formed in the inner cylinder 3 next to the wire feed path 1a. The upper end portion of the gas supply path 11 protrudes above the inner cylinder 3 and is located inside the connection portion 6. An inlet 11 a is provided at the upper end of the gas supply path 11. The inlet 11 a and the air supply port 10 communicate with each other through a passage in the connection portion 6.

The lower end portion of the gas supply path 11 is curved toward the lower side surface of the inner cylinder 3, and an outlet 11b of the gas supply path 11 is formed on the side surface.

4A is a perspective sectional view taken along line IV-IV in FIG. 2, and FIG. 4B is a plan sectional view taken along line IV-IV in FIG. A branch cylinder 12 (cylinder) for branching the shield gas is fitted to the lower end portion of the inner cylinder 3. The branch cylinder 12 is disposed between the nozzle 4 and the lower end portion of the inner cylinder 3, and covers the outlet 11b.

The upper end and the lower end of the branch cylinder 12 are in contact with the inner cylinder 3, but a first space 13 a is formed across the entire circumferential direction between the middle section of the branch cylinder 12 and the inner cylinder 3. ing. The outlet 11b is continuous with the first space 13a. A plurality of through

holes

12 a, 12 a,..., 12 a are arranged in the circumferential direction in the middle of the branch cylinder 12. The through hole 12 a allows the first space 13 a to communicate with the second space 4 a inside the nozzle 4.

As shown by the arrows in FIGS. 2 and 3, the shield gas is supplied from the air supply port 10, passes through the gas supply path 11 and the outlet 11 b, and enters the first space 13 a between the branch cylinder 12 and the inner cylinder 3. It reaches. The shield gas is sent radially through the plurality of through holes 12 a, supplied to the second space 4 a inside the nozzle 4, and discharged from the lower end of the nozzle 4. A voltage is applied to the inner cylinder 3, and an arc is generated between the welding wire and the object inside the shield gas emitted from the nozzle 4, the welding wire is melted, and welding to the object is executed. .

FIG. 5 is a longitudinal sectional view of a welding torch showing a water channel, and FIG. 6 is a perspective sectional view of the welding torch showing a water channel. The welding torch includes a water channel, and the water channel includes a first water channel 31 to an eighth water channel 38.

A first water channel 31 extending in the axial direction is formed next to the wire feed path 1a on the one radial side of the upper part of the inner cylinder 3, and a wire is formed on the other radial side of the upper part of the inner cylinder 3. An eighth water passage 38 extending in the axial direction is formed next to the feed passage 1a. The first water channel 31 and the eighth water channel 38 are arranged on the opposite sides in the radial direction. The upper end portion of the first water channel 31 and the water supply port 8 communicate with each other through a passage formed in the connection portion 6. The upper end portion of the eighth water channel 38 and the drain port 9 communicate with each other through a passage formed in the connection portion 6.

A fourth water channel 34 extending in the axial direction is formed on one radial side of the lower portion of the inner cylinder 3, and a third water channel 33 extending in the axial direction is formed on the other radial side of the lower portion of the inner cylinder 3. Is formed. The lower ends of the third water channel 33 and the fourth water channel 34 reach the bottom of the inner cylinder 3 (hereinafter referred to as the first bottom 3c), and are continuous at the first bottom 3c (see FIG. 14 described later). The lower end of the first water channel 31 and the upper end of the third water channel 33 communicate with each other via a second water channel 32 formed in a spiral shape.

Two

fifth water passages

35, 35 extending in the axial direction are formed on one side in the radial direction of the nozzle 4, and two

sixth water passages

36, 36 are formed on the other side in the radial direction of the nozzle 4. (See FIG. 14 described later). The lower ends of the one fifth water channel 35 and the one sixth water channel 36 reach the bottom of the nozzle 4 (hereinafter referred to as the second bottom 4b), and are continuous at the second bottom 4b. The lower ends of the other fifth water passage 35 and the other sixth water passage 36 are also connected at the second bottom portion 4b (see FIG. 15 described later). The upper end portion of the fifth water passage 35 communicates with the upper end portion of the fourth water passage 34 via a communication passage of the opening / closing portion 40 described later.

A seventh water channel 37 is formed between the third water channel 33 and the eighth water channel 38 in the axial direction. The upper end portion of the sixth water passage 36 communicates with the lower end portion of the eighth water passage 38 through the seventh water passage 37 and the communication passage.

7 is a perspective view of the opening / closing section 40 viewed from above, FIG. 8 is a perspective view of the opening / closing section 40 viewed from below, and FIG. 9 is a schematic longitudinal sectional view of the opening / closing section 40. The opening / closing part 40 includes a cylindrical main body 41 and an annular projecting part 42 projecting radially from the middle part of the main body 41. The tip of the protrusion 42 is bent upward, and the vertical cross-sectional shape of the protrusion 42 is L-shaped (see FIG. 9).

At the upper end of the main body 41, two guide insertion holes 44, 44 penetrating in the radial direction are provided. In the radial direction, the two guide insertion holes 44 are arranged on the opposite sides. A guide 45 (see FIG. 10 described later) is inserted into the guide insertion hole 44. In this embodiment, a bolt is used as the guide 45. Therefore, the guide insertion hole 44 includes a counterbore in which a bolt head is disposed. The guide 45 is not limited to a bolt, and may have another configuration (for example, a pin). The guide insertion hole 44 is located above the protrusion 42.

A plurality of

first communication passages

43 a, 43 a,..., 43 a penetrating in the radial direction are arranged in parallel in the circumferential direction on one side of the lower portion of the main body 41. A plurality of

second communication passages

43b, 43b,..., 43b penetrating in the radial direction are arranged side by side in the circumferential direction. The first communication path 43 a and the second communication path 43 b are located below the protrusion 42.

FIG. 10 is a partially enlarged longitudinal sectional view of a welding torch showing a configuration in the vicinity of the opening / closing part 40 in a state where the water channel is opened. The opening / closing part 40 is provided at the upper end of the nozzle 4 so as to be movable up and down. The lower portion of the main body 41 is disposed between the upper end portion of the nozzle 4 and the lower portion of the inner cylinder 3 in the radial direction. The upper portion of the main body 41 and the protruding portion 42 are disposed above the upper end of the nozzle 4.

A first flange 2 a is formed at the lower end of the outer cylinder 2, and a second flange 4 c is formed at the upper end of the nozzle 4. A male screw 2c is formed on the outer peripheral surface of the first flange 2a. An annular groove 2b is formed in the inner peripheral portion of the first flange 2a. The first flange 2a and the second flange 4c face each other in the axial direction. In the axial direction, the protrusion 42 is disposed between the first flange 2a and the second flange 4c. A biasing member 46 that biases the opening / closing portion 40 downward (contact chip 20 side) is provided between the inside of the projecting portion 42 having an L-shaped cross section and the groove 2b. Examples of the urging member 46 include a spring.

A guide groove 3 a extending in the axial direction is formed in a portion facing the guide insertion hole 44 on the outer peripheral surface of the inner cylinder 3. A guide 45 is inserted into the guide insertion hole 44 and fixed. The tip of the guide 45 is disposed inside the guide groove 3a.

The connecting cylinder 5 is fitted outside the first flange 2a and the upper end of the nozzle 4. A female screw 5 a is formed at the upper end of the connecting cylinder 5. The lower diameter of the connecting cylinder 5 is smaller than the upper diameter. A step portion 5 b is formed at the upper and lower connecting portions of the connecting cylinder 5. The 2nd flange 4c is arrange | positioned between the lower end of the protrusion part 42, and the level | step-difference part 5b. By screwing the female screw 5a of the connecting cylinder 5 and the male screw 2c of the first flange 2a, the second flange 4c and the projecting portion 42 resist the urging force of the urging member 46 and the step portion 5b and the first It is sandwiched between the flanges 2a.

At this time, the fourth water passage 34 and the two fifth water passages 35 communicate with each other via the first communication passage 43a, and the two sixth water passages 36 and the seventh water passage 37 via the second communication passage 43b. Communicate.

11A to 15A are perspective sectional views taken along lines XI-XI to XV-XV shown in FIG. 5, and FIGS. 11B to 15B are XI-XI to XV-XV shown in FIG. It is plane sectional drawing which used the line as the cutting line. Hereinafter, the flow of the cooling water will be described with reference to FIGS. 5, 6, and 10 to 15. The arrows in FIGS. 5, 6, and 11 to 15 indicate the flow of cooling water.

When the cooling water is supplied to the water supply port 8, the cooling water flows downward through the first water channel 31, passes through the second water channel 32, and reaches the third water channel 33 (FIGS. 5, 6, 11 to 11). 13). The cooling water flows further downward through the third water channel 33, reaches the first bottom 3c, changes the flow direction upward, and flows upward through the fourth water channel 34 (FIGS. 5, 6, and 6). 13 and FIG. 14).

In FIG. 14A, the downward arrow indicated by the first bottom portion 3c indicates cooling water flowing downward through the third water channel 33 to the first bottom portion 3c, and the horizontal arc arrow indicates the first bottom portion 3c. The cooling water flowing from the third water channel 33 toward the fourth water channel 34 is shown, and the upward arrow indicates the cooling water flowing upward from the first bottom 3c through the fourth water channel 34.

The cooling water changes the direction of flow outward in the radial direction at the upper end of the fourth water passage 34, passes through the plurality of first communication passages 43a, and flows downward through the two fifth water passages 35 (FIG. 5). , FIG. 6, FIG. 10 and FIG. 13).

The cooling water reaches the second bottom 4b, the cooling water that has flowed through one of the fifth water channels 35 flows upward through one of the sixth water channels 36, and the cooling water that has flowed through the other fifth water channel 35 is: The other sixth water channel 36 flows upward (see FIGS. 5, 6, 14, and 15). In FIG. 15A, the downward white arrow indicates the cooling water flowing downward through one fifth water channel 35 to the second bottom 4b, and the horizontal circular white arrow indicates one of the two bottoms 4b. The cooling water that flows from the fifth water channel 35 toward the one sixth water channel 36 is shown, and the upward white arrow indicates the cooling water that flows upward from the first bottom 3c through the one sixth water channel 36. .

In FIG. 15A, the downward solid arrow indicates the cooling water flowing downward to the second bottom 4b through the other fifth water channel 35, and the horizontal arc solid arrow indicates the other fifth at the second bottom 4b. The cooling water flowing from the water channel 35 toward the other sixth water channel 36 is shown, and the upward solid arrow indicates the cooling water flowing upward from the first bottom 3c through the other sixth water channel 36. In addition, the white arrow and the solid line arrow of the 5th water channel 35 and the 6th water channel 36 in FIG. 15A are used similarly in FIG. 14A.

The cooling water moves upward in the seventh water passage 37 through the plurality of second communication passages 43b by changing the flow direction inward in the radial direction at the upper ends of the two sixth water passages 36. The cooling water that has passed through the two sixth water passages 36 merges in the second communication passage 43b and the seventh water passage 37 and moves upward (see FIGS. 5, 6, 10, 12, and 13). . The cooling water flows upward through the eighth water passage 38 and is discharged from the drain port 9. The cooling water discharged from the drain port 9 is returned to the water supply port 8 after cooling and circulated. The cooling water need not be circulated.

FIG. 16 is a partially enlarged longitudinal sectional view of a welding torch showing a configuration in the vicinity of the opening / closing part 40 in a state where the water channel is closed. For example, when replacing the nozzle 4, the user removes the connecting cylinder 5 from the wire feed cylinder 1 and removes the nozzle 4.

As shown in FIG. 16, when removing the connecting cylinder 5 from the wire feeding cylinder 1, the user releases the screwing between the female screw 5a of the connecting cylinder 5 and the male screw 2c of the first flange 2a. At this time, the connecting cylinder 5 and the nozzle 4 move downward. As described above, since the opening / closing part 40 is urged downward by the urging force of the urging member 46, the opening / closing part 40 also moves downward as the connecting cylinder 5 and the nozzle 4 move downward.

The guide 45 moves downward along the guide groove 3a, and the opening / closing part 40 smoothly moves downward. At this time, as shown in FIG. 16, the first communication passage 43 a and the fourth water channel 34 are not communicated, and the fourth water channel 34 is closed by the main body 41. Further, the second communication path 43 b and the seventh communication path are not communicated, and the seventh water channel 37 is closed by the main body 41. Therefore, when the nozzle 4 is removed, water is prevented from being discharged from the water channel in the wire feeding cylinder 1, that is, the first water channel 31 to the fourth water channel 34, the seventh water channel 37, and the eighth water channel 38. Can do.

When the nozzle 4 is removed, even if water is released, only the water remaining in the fifth water channel 35 and the sixth water channel 36 is discharged, so that the amount of water released can be suppressed.

In the embodiment described above, the wire feed path 1a and the gas supply path 11 can be provided separately to suppress leakage of the shield gas. Further, by providing the wire feed path 1a and the gas supply path 11 in the single wire feed cylinder 1, it is possible to avoid an increase in the size of the welding torch.

Further, since the plurality of through holes 12a are arranged in the circumferential direction in the branch cylinder 12, the diameter of the through hole 12a is made smaller than that in the case of providing a single large diameter through hole 12a, and the inside of the first space 13a is reduced. Can increase the pressure. The shield gas is sent out radially from the plurality of through holes 12a. As a result, the shielding gas having substantially the same flow rate is sent radially from each through-hole 12a, and the periphery of the arc is stably covered with the shielding gas, thereby suppressing the occurrence of poor welding.

As shown below, the configuration of the welding torch according to the embodiment may be partially changed. 17 is a cross-sectional view schematically showing the first gas supply path 11a to the fourth gas supply path 11d, and FIG. 18 is a view of the inner cylinder 3 and the branch cylinder 12 schematically showing the first chamber 131 to the fourth chamber 134. It is a cross-sectional view.

In the embodiment described above, the gas supply path 11 is single, but as shown in FIG. 17, instead of the single gas supply path 11, a plurality of gas supply paths, for example, the first gas supply path, are provided. 11a to fourth gas supply path 11d may be formed in the inner cylinder 3. In this case, as shown in FIG. 18, four

partitions

12b, 12b, 12b, 12b are provided on the inner peripheral surface of the branch cylinder 12 at a phase interval of about 90 degrees around the axis.

When the branch cylinder 12 is externally fitted to the inner cylinder 3, four chambers, that is, the first chamber 131 to the fourth chamber 134 are formed in the first space 13a by the four partitions 12b. The outlets of the first gas supply path 11a to the fourth gas supply path 11d are connected to the first chamber 131 to the fourth chamber 134, respectively.

By forming the first chamber 131 to the fourth chamber 134 connected to the first gas supply path 11a to the fourth gas supply path 11d in the first space 13a, respectively, the first chamber 131 to the fourth chamber are compared with the first space 13a. Since the volume of each chamber 134 is reduced, the pressure in each of the first chamber 131 to the fourth chamber 134 can be increased to a desired pressure in a short time.

Note that the four gas supply paths and chambers are examples, and two or three gas supply paths and chambers, or five or more gas supply paths and chambers may be provided.

Further, as shown below, the configuration of the welding torch according to the embodiment may be partially changed. FIG. 19 is a partially enlarged longitudinal sectional view showing a state in which the branch cylinder 12 is screwed into the inner cylinder 3. A female screw 12 b may be formed at the lower end of the branch cylinder 12, and a male screw 3 b corresponding to the female screw 12 b may be formed on the outer peripheral surface of the inner cylinder 3.

When externally fitting the branch cylinder 12 to the inner cylinder 3, it is possible to prevent the shielding gas from leaking from the first space 13a by screwing the female screw 12b and the male screw 3b. Moreover, the sealing degree in the 1st space 13a increases by the labyrinth effect of screwing, and it becomes easy to raise the pressure in the 1st space 13a.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and the scope equivalent to the scope of the claims. .

DESCRIPTION OF SYMBOLS 1 Wire feed cylinder 1a Wire feed path 2 Outer cylinder 3 Inner cylinder 3b Male screw 3c 1st bottom part 4 Nozzle 4a 2nd space 11 Gas supply path 11a Inlet 11b Outlet 12 Branch cylinder (cylinder body)
12a Through hole 12b Female screw 13a First space 20 Contact tip 131-134 First chamber to fourth chamber

Claims

A wire feeding cylinder having a wire feeding path for feeding a welding wire;
A contact tip attached to the end of the wire feed tube;
A cylindrical nozzle provided around the contact chip and through which a shielding gas flows;
The wire feeding cylinder has a gas supply path for supplying the shield gas to the nozzle separately from the wire feeding path.
An outlet of the gas supply path formed on the outer peripheral surface of the wire feeding cylinder;
A cylindrical body that is externally fitted to the wire feeding cylinder and covers the outlet, and a plurality of through holes arranged in the circumferential direction;
A first space is provided between the cylindrical body and the wire feeding cylinder;
The welding torch according to claim 1, wherein the first space communicates with the second space inside the nozzle by the through hole.
The wire feeding cylinder has a plurality of the gas supply paths,
The welding torch according to claim 2, wherein chambers connected to each of the plurality of gas supply paths are formed in the first space.
The welding torch according to claim 2 or 3, wherein the cylindrical body is screwed into the wire feeding cylinder.