Welding torch and adapter kit

1. A welding torch comprising:

a non-consumable electrode that generates an arc toward a material to be welded;

a collet that supports the non-consumable electrode which is being inserted into the inside of the collet;

a collet body that internally holds the collet in a state where the non-consumable electrode protrudes from a tip side of the collet body;

a torch body that mounts the collet body and comprises a power supply portion that supplies electric power to the non-consumable electrode via the collet body and the collet, and a first flow channel that supplies a first shielding gas;

an inner nozzle that is mounted to the collet body surrounding the periphery of the non-consumable electrode and discharges the first shielding gas, the inner nozzle being mounted on an outer circumferential portion of the collet body;

an attachment that is removably mounted to the torch body in a state where the inner nozzle is inserted into an inside of the attachment, and comprises a second flow channel that supplies a second shielding gas; and

an outer nozzle that is mounted to the attachment surrounding the periphery of the inner nozzle and discharges the second shielding gas, wherein

the attachment is removably mounted by being interposed between the torch body and the inner nozzle; and

the collet body has a flow channel through which the first shielding gas supplied from the torch body flows.

2. The welding torch according to claim 1 , wherein the attachment is removably mounted to the torch body in such a way that the attachment and the outer nozzle can be removed from the torch body to thereby convert the welding torch from a double nozzle structure to a single nozzle structure.

3. The welding torch according to claim 1 , further comprising a torch cap that is positioned on a first side of the torch body that is opposite to a second side of the torch body on which the collet body is mounted, and that fixes the non-consumable electrode, wherein the torch cap is mounted with a gasket which is disposed between the torch cap and the torch body.

4. The welding torch according to claim 1 , further comprising,

a handle that is mounted to the torch body, and

a welding cable which integrates a power supply cable that supplies electric power to the power supply portion and a hose that introduces the first shielding gas to the first flow channel, wherein the welding cable passes through an inside of the handle and is connected to a connection portion that is provided in the torch body.

5. The welding torch according to claim 1 , wherein a connection portion which connects to a hose that introduces the second shielding gas is provided in the attachment.

6. The welding torch according to claim 1 , further comprising, a gas lens that is disposed between the inner nozzle and the outer nozzle and corrects the flow of the second shielding gas that is discharged from the outer nozzle.

7. The welding torch according to claim 1 , wherein the collet body is formed so as to integrate with a gas lens that corrects the flow of the first shielding gas that is discharged from the inner nozzle.

8. The welding torch according to claim 1 , wherein the outer nozzle is shaped such that it forms an after-shield structure that delivers the second shielding gas to portions of a welding bead that has just been formed by the welding torch as the welding torch moves along a welding line direction.

9. The welding torch according to claim 1 , wherein the attachment is removably mounted only by being interposed between the torch body and the inner nozzle.

10. The welding torch according to claim 1 , wherein the attachment has a through-hole that penetrates in a direction into which a non-consumable electrode is inserted, and wherein the second flow channel is formed in a ring shape so as to surround a periphery of the through-hole in an inner portion of the attachment.

11. The welding torch according to claim 8 , wherein the outer nozzle has one of an elliptical cylindrical shape and a rectangular shape.