Welding Nozzle Kit

Abstract

To provide a welding nozzle kit capable of achieving a stable shielding effect. [Solution] A welding nozzle kit having a center gas nozzle, the center gas nozzle circumferentially surrounding an electrode and a collet to form a center gas flow passage, the electrode having a central axis and being rod-shaped extending along the central axis, the center gas flow passage causing center gas to flow and be ejected, the center gas nozzle being connectable to a torch body, and the center gas nozzle being connected to the torch body to form a welding torch, the welding nozzle kit having an adjustment space for adjusting the flow of the center gas to a laminar flow.

Description

[Technical Field]

[0001] The present invention relates to a weld nozzle kit. [Background technology]

[0002] A welding nozzle kit is known that has a center gas nozzle, which circumferentially surrounds the electrode and collet to form a center gas flow path, the electrode has a central axis and is rod-shaped extending along the central axis, the center gas flow path causes the center gas to flow and be ejected, and the center gas nozzle is connectable to a torch body, and the welding torch is formed by connecting the center gas nozzle to the torch body (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5178963 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a welding nozzle kit that can achieve a stable shielding effect. [Means for solving the problem]

[0005] One aspect of the present invention is as follows.

[0006] [Section 1] It has a center gas nozzle, the center gas nozzle circumferentially surrounds the electrode and the collet to form a center gas flow passage; the electrode has a central axis and is rod-shaped extending along the central axis, The center gas flow passage allows the center gas to flow and be ejected, the center gas nozzle is connectable to a torch body; a welding nozzle kit, the center gas nozzle being connected to the torch body to form a welding torch, The center gas passage has an adjustment space for adjusting the flow of the center gas to a laminar flow.

[0007] [Section 2] the center gas nozzle has a nozzle base, an inner cylinder, and an outer cylinder; the nozzle base is connected to the torch body; the center gas passage has an outer passage, an inner passage, and a passage connection portion; the outer flow path has the adjustment space and is defined by an outer peripheral surface of the inner cylindrical portion and an inner peripheral surface of the outer cylindrical portion, the inner flow path is defined by an inner circumferential surface of the inner cylindrical portion, an outer circumferential surface of the collet, and an outer circumferential surface of the electrode in a radial direction, the flow path connection portion connects the inner flow path to the outer flow path, Item 2. The welding nozzle kit according to item 1, wherein the center gas flows through the inner passage, the passage connection portion, and the outer passage in this order and is ejected from the tip of the center gas passage.

[0008] [Section 3] Item 3. The welded nozzle kit according to item 2, wherein an axial base end of the outer flow passage is closed by the nozzle base.

[0009] [Section 4] An outer gas nozzle is provided. the outer gas nozzle surrounds the center gas nozzle in the circumferential direction to form an outer gas flow path, The outer gas flow passage allows the outer gas to flow and be ejected, the center gas nozzle is removably connectable to the torch body; the outer gas nozzle is detachably connectable to the torch body; the center gas nozzle and the outer gas nozzle are connected to the torch body to form a double shield gas welding torch; 4. The welding nozzle kit according to any one of items 1 to 3, wherein only the center gas nozzle of the center gas nozzle and the outer gas nozzle is connected to the torch body to form a single-shielded gas welding torch.

[0010] [Section 5] the center gas nozzle has an outer gas distribution member and a gas lens; the outer gas distribution member has a plurality of distribution channels; The distribution channel extends in an axial direction, the plurality of distribution flow paths are configured by arranging the distribution flow paths at equal intervals in the circumferential direction while shifting their positions, the gas lens is a porous member having a gap, and is provided on the axially distal end side of the plurality of distribution flow paths, the plurality of distribution flow paths of the outer gas distribution member and the gap of the gas lens are provided in this order downstream in the outer gas flow path, Item 5. The welding nozzle kit according to item 4, wherein the outer gas nozzle is connected to the torch body by being attached to the center gas nozzle via the outer gas distribution member.

[0011] [Section 6] the outer gas nozzle has a connecting member and an outer nozzle tip portion, The connecting member and the outer nozzle tip portion each have a cylindrical shape, The outer circumferential surface of the connecting member is connected to an outer gas supply pipe, the outer gas supply pipe supplies the outer gas; an inner circumferential surface of the connecting member defines a part of the outer gas flow path; an outer diameter of the outer gas distribution member is larger than a minimum diameter of the inner circumferential surface of the connecting member; Item 6. The welding nozzle kit according to item 5, wherein the outer nozzle tip can be attached to the center gas nozzle via the outer gas distribution member, thereby being in close contact with the connecting member.

[0012] [Section 7] A welding method using the welding nozzle kit according to any one of items 1 to 6, A welding method comprising a welding step of performing welding with the welding torch formed by connecting the center gas nozzle to the torch body. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a welding nozzle kit that can achieve a stable shielding effect. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a partial cross-sectional view showing a dual-shield gas welding torch formed by a welding nozzle kit according to an embodiment of the present invention; [Figure 2] FIG. 2 is an enlarged view of part A in FIG. [Figure 3] 2 is a partial cross-sectional view showing a single-shielded gas welding torch formed by the welding nozzle kit of FIG. 1. [Figure 4] FIG. 10 is a partial cross-sectional view showing a double-shielded gas welding torch formed by a modified welding nozzle kit. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] 1 and 2, in one embodiment of the present invention, a welding nozzle kit 1 includes a center gas nozzle 2 that circumferentially surrounds an electrode 4 and a collet 3 to form a center gas passage C. The electrode 4 has a central axis O and is rod-shaped extending along the central axis O, and the center gas passage C causes center gas to flow and be ejected. The center gas nozzle 2 is connectable to a torch body 5, and the welding nozzle kit 1 forms a welding torch 10 by connecting the center gas nozzle 2 to the torch body 5. The welding torch 10 performs TIG welding (Tungsten Inert Gas welding). The center gas passage C includes an adjustment space S that adjusts the flow of the center gas to a laminar flow. The center gas nozzle 2 has a nozzle base 2c, an inner cylinder 2d, and an outer cylinder 2e. The nozzle base 2c is connected to the torch body 5. The center gas passage C has an outer passage C3, an inner passage C4, and a passage connection C5. The outer passage C3 has an adjustment space S and is defined by the outer peripheral surface of the inner cylinder 2d and the inner peripheral surface of the outer cylinder 2e. The inner passage C4 is defined by being sandwiched radially between the inner peripheral surface of the inner cylinder 2d, the outer peripheral surface of the collet 3, and the outer peripheral surface of the electrode 4. The passage connection C5 connects the inner passage C4 to the outer passage C3. The center gas flows through the inner passage C4, the passage connection C5, and the outer passage C3 in this order before being ejected from the tip of the center gas passage C. The axial base end of the outer passage C3 is closed by the nozzle base 2c. The detailed configuration is described below.

[0017] 2, the center gas nozzle 2 has a pressing portion 2a and a center nozzle tip portion 2b. The pressing portion 2a presses the tip portion of the collet 3 radially inward to support the electrode 4 on the collet 3. The inner peripheral surface of the center nozzle tip portion 2b and the outer peripheral surface of the electrode 4 define a center tip passage C1. The center gas passage C has a reduced diameter passage C2. The reduced diameter passage C2 has a ring shape that extends continuously in the circumferential direction. The distal end surface and base end surface of the reduced diameter passage C2 gradually reduce in diameter toward the distal end in the axial direction. The axial tip side is the direction from the proximal end side to the distal end side of the electrode 4 in the axial direction along the central axis O. The inner peripheral edge of the reduced diameter passage C2 connects to the center tip passage C1 axially distal side of the pressing portion 2a. The distal end surface and base end surface of the reduced diameter passage C2 each form a straight line over the entire circumference in a vertical cross section including the central axis O. The distal end surface and the proximal end surface of the reduced diameter flow path C2 may each be configured to be curved in longitudinal section over the entire circumference.

[0018] The center gas nozzle 2 has a nozzle base 2c, an inner cylinder 2d, and an outer cylinder 2e. The nozzle base 2c is connected to the torch body 5. The inner cylinder 2d extends from the nozzle base 2c toward the axial tip. The outer cylinder 2e extends from the nozzle base 2c toward the axial tip, radially outward of the inner cylinder 2d. The center gas passage C has an outer passage C3, an inner passage C4, and a passage connection C5. The outer passage C3 has an adjustment space S and is defined by the outer peripheral surface of the inner cylinder 2d and the inner peripheral surface of the outer cylinder 2e. The axial tip end of the outer passage C3 (adjustment space S) is connected to the outer peripheral edge of the reduced diameter passage C2. The adjustment space S is connected to the passage connection C5. The outer flow passage C3 has a ring shape that extends continuously in the circumferential direction over the entire length L from the nozzle base 2c to the outer peripheral edge of the reduced-diameter flow passage C2, the flow passage cross-sectional area does not change substantially over the entire length L so that no change in flow rate occurs due to a pressure difference, the end of the outer flow passage C3 on the base end side in the axial direction is closed by the nozzle base 2c, the inner flow passage C4 is defined by the inner peripheral surface of the inner cylindrical portion 2d, the outer peripheral surface of the collet 3, and the outer peripheral surface of the electrode 4, the flow passage connection C5 connects the inner flow passage C4 to the outer flow passage C3, and the center gas flows through the inner flow passage C4, the flow passage connection C5, the outer flow passage C3, the reduced-diameter flow passage C2, and the center tip flow passage C1 in this order, and is ejected from the tip of the center tip flow passage C1.

[0019] In this embodiment, the direction opposite to the axial tip side is referred to as the axial base side, the direction perpendicular to the central axis O is referred to as the radial direction, and the direction going around the central axis O is referred to as the circumferential direction.

[0020] According to the above configuration, the center gas flow passage C has the adjustment space S, and therefore the center gas adjusted to a laminar flow can be ejected from the tip of the center gas nozzle 2 (center nozzle tip portion 2b), thereby obtaining a stable shielding effect. Furthermore, the center gas flow passage C has a reduced-diameter flow passage C2, which enhances the adjustment function to a laminar flow.

[0021] The adjustment space S has an annular shape that extends continuously in the circumferential direction with a constant radial width W over the entire length L from the flow path connecting portion C5 to the outer peripheral edge of the diameter-reduced flow path C2. From the viewpoint of enhancing the function of adjusting to a laminar flow, the entire length L of the adjustment space S is preferably 10 times or more, and more preferably 30 times or more and 60 times or less, the radial width W of the adjustment space S.

[0022] Furthermore, because the axial base end of the outer flow passage C3 is closed by the nozzle base 2c, the welding torch 10 can be formed without attaching a gasket separate from the center gas nozzle 2 to the torch body 5. Therefore, good assembly workability can be achieved for forming the welding torch 10.

[0023] The welding nozzle kit 1 has an outer gas nozzle 6, which circumferentially surrounds the center gas nozzle 2 to form an outer gas flow path D, through which the outer gas flows and is ejected. The center gas nozzle 2 is detachably connectable to a torch body 5, and the outer gas nozzle 6 is detachably connectable to the torch body 5. As shown in FIG. 1, the welding nozzle kit 1 forms a double-shielded gas welding torch 12 by connecting the center gas nozzle 2 and the outer gas nozzle 6 to the torch body 5. As shown in FIG. 3, the welding nozzle kit 1 forms a single-shielded gas welding torch 11 by connecting only the center gas nozzle 2 of the center gas nozzle 2 and the outer gas nozzle 6 to the torch body 5. With the above configuration, by changing the way the welding nozzle kit 1 is assembled to the same torch body 5, electrode 4, and collet 3, it is possible to switch between use as the single-shielded gas welding torch 11 and use as the double-shielded gas welding torch 12.

[0024] The outer gas nozzle 6 is connected to an outer gas supply pipe 7, which supplies outer gas. According to the above configuration, by separating the outer gas nozzle 6 from the torch body 5, the outer gas supply pipe 7 can also be separated, making it possible to use it as a compact single-shielded gas welding torch 11.

[0025] The outer gas supply pipe 7 has an outer gas supply passage D1, and the outer gas supply passage D1 supplies the outer gas to the outer gas passage D through the base end of the outer gas nozzle 6. Note that, as in a modified example shown in FIG. 4 , the torch body 5 may have an outer gas supply passage D1, and the outer gas supply passage D1 may supply the outer gas to the outer gas passage D through the base end of the outer gas nozzle 6.

[0026] The center gas nozzle 2 includes an outer gas distribution member 2f and a gas lens 2g. The outer gas distribution member 2f has multiple distribution passages 2f1 extending axially. The distribution passages 2f1 are arranged circumferentially at equal intervals. The gas lens 2g is a porous member with voids and is located axially distal to the multiple distribution passages 2f1. The multiple distribution passages 2f1 of the outer gas distribution member 2f and the voids in the gas lens 2g are arranged downstream in this order in the outer gas passage D. The outer gas nozzle 6 is attached to the center gas nozzle 2 via the outer gas distribution member 2f, thereby connecting to the torch body 5. This configuration allows the multiple distribution passages 2f1 and the voids in the gas lens 2g to rectify the outer gas, thereby achieving a more stable shielding effect. Furthermore, simple assembly via the outer gas distribution member 2f, which forms the multiple distribution passages 2f1, allows for stable connection of the outer gas nozzle 6 to the torch body 5.

[0027] The outer gas nozzle 6 has a connecting member 6a and an outer nozzle tip 6b, each of which is cylindrical, the outer peripheral surface of the connecting member 6a is connected to an outer gas supply pipe 7 which supplies outer gas, the inner peripheral surface of the connecting member 6a defines a part of the outer gas flow path D, the outer diameter of the outer gas distribution member 2f is larger than the minimum diameter of the inner peripheral surface of the connecting member 6a, and the outer nozzle tip 6b can be attached to the center gas nozzle 2 via the outer gas distribution member 2f to be in close contact with the connecting member 6a. With the above configuration, the size of the outer diameter of the connecting member 6a can be reduced, and the outer gas nozzle 6 can be attached via the outer gas distribution member 2f.

[0028] The center gas nozzle 2 includes an inner cylindrical member 2h and an outer cylindrical member 2i. The inner cylindrical member 2h includes an inner cylindrical portion 2d and a portion of the nozzle base 2c connected to the inner cylindrical portion 2d. The outer cylindrical member 2i includes an outer cylindrical portion 2e and a portion of the nozzle base 2c connected to the outer cylindrical portion 2e. The outer peripheral surface of the inner cylindrical member 2h and the inner peripheral surface of the outer cylindrical member 2i are joined in close contact with each other at the nozzle base 2c. In this embodiment, the joining is performed by welding using a brazing material. However, the joining may be performed by welding without using a brazing material, or by a method other than welding. The center gas nozzle 2 is not limited to a configuration formed by joining the inner cylindrical member 2h and the outer cylindrical member 2i.

[0029] The outer gas distribution member 2f has an annular shape extending continuously in the circumferential direction, and the inner peripheral surface of the outer gas distribution member 2f is fitted and joined to the outer peripheral surface of the center gas nozzle 2. Note that the inner peripheral surface of the outer gas distribution member 2f may be fitted to the outer peripheral surface of the center gas nozzle 2 without being joined to it.

[0030] The outer peripheral surface of the center gas nozzle 2 has a stepped portion 2j, a threaded portion 2k, and an attachment cap 2l, the stepped portion 2j tapering in a stepped manner toward the axial tip, the threaded portion 2k being located axially further toward the tip than the stepped portion 2j, and the attachment cap 2l having a threaded portion 2l1, which threads into the threaded portion 2k with the outer gas distribution member 2f disposed between the stepped portion 2j and the base end face of the attachment cap 2l, thereby holding the outer gas distribution member 2f to the center gas nozzle 2. Both or one of the threaded portion 2l1 and the threaded portion 2k are configured by a screw centered on the central axis O.

[0031] The center gas nozzle 2 has an intermediate cylinder 2m. The intermediate cylinder 2m connects the tip of the outer cylinder portion 2e to the base end of the center nozzle tip portion 2b. The inner circumferential surface of the intermediate cylinder 2m has a tip end surface of the reduced-diameter flow path C2. The outer circumferential surface of the intermediate cylinder 2m has a threaded engagement portion 2k. The center nozzle tip portion 2b is attached to the intermediate cylinder 2m. The inner circumferential surface of the attachment cap 2l has a locking step 2l2 that tapers in a step-like manner toward the axial tip. The outer circumferential surface of the center nozzle tip portion 2b has a flange portion 2b1 that protrudes radially outward. With the flange portion 2b1 positioned between the locking step 2l2 and the tip surface of the intermediate cylinder 2m, the threaded engagement portion 2l2 threads into the threaded engagement portion 2k, thereby holding the center nozzle tip portion 2b in place on the intermediate cylinder 2m. Note that the center nozzle tip portion 2b may be integrally formed with the intermediate cylinder 2m.

[0032] The center tip flow path C1 is defined by the inner circumferential surface of the center nozzle tip 2b, a portion of the inner circumferential surface of the intermediate cylinder 2m that is axially distal to the tip surface of the reduced diameter flow path C2, and the outer circumferential surface of the electrode 4.

[0033] The torch body 5 has a holding portion 5a, a handle portion 5b, and a housing portion 5c. The holding portion 5a is cylindrical and centered on a central axis O. The center gas nozzle 2 and the outer gas nozzle 6 are connectable to the holding portion 5a. The handle portion 5b extends radially outward from the holding portion 5a, and the housing portion 5c extends axially from the holding portion 5a toward the base end. The housing portion 5c houses the base end of the electrode 4. The inner circumferential surface of the holding portion 5a has a tip-side inner circumferential surface 5a1, a stepped surface 5a2, and a base-side inner circumferential surface 5a3. The inner diameter of the tip-side inner circumferential surface 5a1 is larger than the inner diameter of the base-side inner circumferential surface 5a3. The stepped surface 5a2 tapers in a stepped manner from the base end of the tip-side inner circumferential surface 5a1 to the tip of the base-side inner circumferential surface 5a3. The torch body 5 has a center gas supply passage C6, which passes through the inside of the handle portion 5b and opens to the base-side inner circumferential surface 5a3 of the holder 5a. The inner passage C4 is defined by the inner circumferential surfaces of the inner cylinder portion 2d and the nozzle base 2c and the outer circumferential surfaces of the collet 3 and the electrode 4. The center gas supplied from the center gas supply passage C6 passes inside the base-side inner circumferential surface 5a3 of the holder 5a and flows into the base end of the inner passage C4.

[0034] The axial base end of the connecting member 6a constitutes a connecting tube portion 6a1, and the outer peripheral surface of the connecting tube portion 6a1 can be detachably connected to the tip-side inner peripheral surface 5a1 of the holding portion 5a of the torch body 5 by threading. The inner peripheral surface of the connecting member 6a has an inlet 6a2, through which outer gas supplied from the outer gas supply pipe 7 flows into the outer gas flow path D. The inner peripheral surface of the connecting member 6a has a first inner peripheral surface 6a3, a second inner peripheral surface 6a4, and a third inner peripheral surface 6a5, which are connected in this order toward the axial tip end. The inner diameter of the second inner peripheral surface 6a4 is larger than the inner diameter of the first inner peripheral surface 6a3, and the inner diameter of the third inner peripheral surface 6a5 is larger than the inner diameter of the second inner peripheral surface 6a4. In other words, the smallest diameter of the inner peripheral surface of the connecting member 6a is the inner diameter of the first inner peripheral surface 6a3. The inlet 6a2 is provided in the second inner peripheral surface 6a4. The first inner circumferential surface 6a3, the second inner circumferential surface 6a4, and the third inner circumferential surface 6a5 each face the outer circumferential surface of the nozzle base 2c.

[0035] The axial base end face of the outer nozzle tip portion 6b is in close contact with the axial tip end face of the outer peripheral edge of the connecting member 6a via an elastic seal ring 8. The inner peripheral surface of the outer nozzle tip portion 6b is detachably connected to the outer peripheral surface of the outer gas distribution member 2f by threading. The inner diameter of the tip of the outer nozzle tip portion 6b is smaller than the outer diameter of the outer gas distribution member 2f.

[0036] The outer peripheral surface of the base end of the nozzle base 2c (inner cylindrical member 2h) has a connecting threaded portion 2c1, which can be detachably connected by threading to a base-end inner peripheral surface 5a3 of the holding portion 5a of the torch body 5. The nozzle base 2c (outer cylindrical member 2i) has a sealing surface 2c2 facing the base end in the axial direction, which is located axially further toward the tip end than the connecting threaded portion 2c1, and comes into close contact with the stepped surface 5a2 of the holding portion 5a when the outer peripheral surface of the base end of the nozzle base 2c is connected by threading to the base-end inner peripheral surface 5a3 of the holding portion 5a. The base end surface of the outer cylindrical member 2i has the sealing surface 2c2.

[0037] The inner cylinder 2d, the outer cylinder 2e, and the center nozzle tip 2b are cylindrical. The collet 3 is cylindrical and centered on the central axis O, and has slits 3a. The slits 3a extend from the tip of the collet 3 toward the base end in the axial direction. The collet 3 has multiple (four) slits 3a arranged at equal intervals in the circumferential direction.

[0038] The electrode 4 can be made of a metal material with a high melting point, such as tungsten. In addition to tungsten, a metal material containing an oxide such as thorium oxide, lanthanum oxide, cerium oxide, yttrium oxide, or zirconium oxide can also be used.

[0039] The type of gas used as the center gas is not particularly limited, but for example, an inert gas such as argon or helium, or a mixed gas in which hydrogen, helium, nitrogen, or other gas is added to argon, can be used.

[0040] The type of gas used as the outer gas is not particularly limited, but the above-mentioned inert gas or mixed gas may be used, or a mixed gas in which an oxidizing gas such as oxygen or carbon dioxide is added to an inert gas such as argon or helium may be used.

[0041] According to this embodiment, a welding method can be implemented that includes a welding step in which welding is performed using a welding torch 10 formed by connecting the center gas nozzle 2 to the torch body 5. Also, according to this embodiment, a welding method can be implemented that includes a double-shielded gas welding step in which welding is performed using a double-shielded gas welding torch 12 formed by connecting the center gas nozzle 2 and the outer gas nozzle 6 to the torch body 5, and a single-shielded gas welding step in which welding is performed using a single-shielded gas welding torch 11 formed by connecting only the center gas nozzle 2 of the center gas nozzle 2 and the outer gas nozzle 6 to the torch body 5.

[0042] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be modified in various ways without departing from the gist of the present invention. [Explanation of symbols]

[0043] 1 Welding Nozzle Kit 2 Center gas nozzle 2a Pressing part 2b Center nozzle tip 2b1 Flange part 2c Nozzle base 2c1 Connection screw part 2c2 Close contact surface 2d inner cylinder part 2e Outer cylinder 2f Outer gas distribution member 2f1 Distribution channel 2g gas lens 2h Inner cylinder material 2i Outer cylinder material 2j Step 2k Threaded part 2L Mounting Cap 2l1 Threaded part 2l2 Locking step 2m intermediate tube 3 Colette 3a Slit 4 electrodes 5 Torch body 5a Holding part 5a1 Tip side inner surface 5a2 Step surface 5a3 Proximal inner circumferential surface 5b Handle 5c Storage section 6 outer gas nozzle 6a Connecting member 6a1 Connecting tube 6a2 Inlet 6a3 1st inner surface 6a4 Second inner surface 6a5 3rd inner surface 6b Outer nozzle tip 7 Outer gas supply pipe 8 Seal ring 10. Welding torch 11 Single-shielded gas welding torch 12 Double shielded gas welding torch C Center gas passage C1 Center tip flow channel C2 Reduced diameter channel C3 Outer channel C4 Inner channel C5 Flow path connection C6 Center gas supply channel D Outer gas passage D1 Outer gas supply passage L total length O center axis S adjustment space W radial width

Claims

1. It has a center gas nozzle, the center gas nozzle circumferentially surrounds the electrode and the collet to form a center gas flow passage; the electrode has a central axis and is rod-shaped extending along the central axis, The center gas flow passage allows the center gas to flow and be ejected, the center gas nozzle is connectable to a torch body; a welding nozzle kit, the center gas nozzle being connected to the torch body to form a welding torch, The center gas passage has an adjustment space for adjusting the flow of the center gas to a laminar flow.

2. the center gas nozzle has a nozzle base, an inner cylinder, and an outer cylinder; the nozzle base is connected to the torch body; the center gas passage has an outer passage, an inner passage, and a passage connection portion; the outer flow path has the adjustment space and is defined by an outer peripheral surface of the inner cylindrical portion and an inner peripheral surface of the outer cylindrical portion, the inner flow path is defined by an inner circumferential surface of the inner cylindrical portion, an outer circumferential surface of the collet, and an outer circumferential surface of the electrode in a radial direction, the flow path connection portion connects the inner flow path to the outer flow path, 2. The welding nozzle kit according to claim 1, wherein the center gas flows through the inner passage, the passage connection portion, and the outer passage in this order, and is ejected from a tip of the center gas passage.

3. The weld nozzle kit of claim 2 , wherein an axially proximal end of the outer flow passage is closed by the nozzle base.

4. An outer gas nozzle is provided. the outer gas nozzle surrounds the center gas nozzle in the circumferential direction to form an outer gas flow path, The outer gas flow passage allows the outer gas to flow and be ejected, the center gas nozzle is removably connectable to the torch body; the outer gas nozzle is detachably connectable to the torch body; the center gas nozzle and the outer gas nozzle are connected to the torch body to form a double shield gas welding torch; The welding nozzle kit according to claim 1 , wherein only the center gas nozzle of the center gas nozzle and the outer gas nozzle is connected to the torch body to form a single-walled shielded gas welding torch.

5. the center gas nozzle has an outer gas distribution member and a gas lens; the outer gas distribution member has a plurality of distribution channels; The distribution channel extends in an axial direction, the plurality of distribution flow paths are configured by arranging the distribution flow paths at equal intervals in the circumferential direction while shifting their positions, the gas lens is a porous member having a gap, and is provided on the axially distal end side of the plurality of distribution flow paths, the plurality of distribution flow paths of the outer gas distribution member and the gap of the gas lens are provided in this order downstream in the outer gas flow path, The welding nozzle kit according to claim 4 , wherein the outer gas nozzle is connected to the torch body by being attached to the center gas nozzle via the outer gas distribution member.

6. the outer gas nozzle has a connecting member and an outer nozzle tip portion, The connecting member and the outer nozzle tip portion each have a cylindrical shape, The outer circumferential surface of the connecting member is connected to an outer gas supply pipe, the outer gas supply pipe supplies the outer gas; an inner circumferential surface of the connecting member defines a part of the outer gas flow path; an outer diameter of the outer gas distribution member is larger than a minimum diameter of the inner circumferential surface of the connecting member; The welding nozzle kit according to claim 5 , wherein the outer nozzle tip is attached to the center gas nozzle via the outer gas distribution member, so that the outer nozzle tip can be in close contact with the connecting member.

7. A welding method using the welding nozzle kit according to any one of claims 1 to 6, A welding method comprising a welding step of performing welding with the welding torch formed by connecting the center gas nozzle to the torch body.

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