Abstract: A welding method, which performs non-keyhole welding of a ferritic stainless steel having a plate thickness of 3 mm or less using a plasma welding torch (10), includes supplying an inert gas, as a pilot gas (23), into the gap between a tungsten electrode (11) and an insert chip (12) at a flow rate of 2.1 m/sec or less, and supplying a shield gas (24) into the gap between the insert chip (12) and a shield cap (15), wherein a mixed gas prepared by adding either 0.5 to 4 vol % of oxygen gas or 1 to 6 vol % of carbon dioxide gas to an inert gas is used as the shield gas (24).

Abstract: A TIG welding method for a ferrite stainless steel sheet is disclosed, wherein a first shield gas is used wherein the gas is a mixture of argon gas and helium gas, 20 to 90% by volume of helium is included in the mixture, and the flow rate S1 of the first shield gas is set in a range of 0.175 m/sec?S1?1.75 m/sec, and a second shield gas is used wherein the gas is argon gas, and the flow rate S2 of the second shield gas is set in a range of 0.05 m/sec?S2?1.51 m/sec.

Abstract: According to the present invention, an adapter kit is provided in which a welding torch having a single nozzle structure is switched to a welding torch having a double nozzle structure. In an adapter kit (20A) which is installed in a switchable manner in a welding torch (1A) having a single nozzle structure, the present invention includes an attachment (7A) which is mounted to the torch body (5) in a state where the torch nozzle (inner nozzle) (6A) is inserted into the attachment after the gasket is removed and in which a flow channel that supplies a second shielding gas is provided, and an outer nozzle (8A) that is mounted to the attachment (7A) surrounding the periphery of the torch nozzle (6A) and discharges a second shielding gas.

Abstract: A TIG welding method for a ferrite stainless steel sheet is disclosed, wherein a first shield gas is used wherein the gas is a mixture of argon gas and helium gas, 20 to 90% by volume of helium is included in the mixture, and the flow rate S1 of the first shield gas is set in a range of 0.175 m/sec?S1?1.75 m/sec, and a second shield gas is used wherein the gas is argon gas, and the flow rate S2 of the second shield gas is set in a range of 0.05 m/sec?S2?1.51 m/sec.

Abstract: A welding method, which performs non-keyhole welding of a ferritic stainless steel having a plate thickness of 3 mm or less using a plasma welding torch (10), includes supplying an inert gas, as a pilot gas (23), into the gap between a tungsten electrode (11) and an insert chip (12) at a flow rate of 2.1 m/sec or less, and supplying a shield gas (24) into the gap between the insert chip (12) and a shield cap (15), wherein a mixed gas prepared by adding either 0.5 to 4 vol % of oxygen gas or 1 to 6 vol % of carbon dioxide gas to an inert gas is used as the shield gas (24).

Abstract: According to the present invention, an adapter kit is provided in which a welding torch having a single nozzle structure is switched to a welding torch having a double nozzle structure. In an adapter kit (20A) which is installed in a switchable manner in a welding torch (1A) having a single nozzle structure, the present invention includes an attachment (7A) which is mounted to the torch body (5) in a state where the torch nozzle (inner nozzle) (6A) is inserted into the attachment after the gasket is removed and in which a flow channel that supplies a second shielding gas is provided, and an outer nozzle (8A) that is mounted to the attachment (7A) surrounding the periphery of the torch nozzle (6A) and discharges a second shielding gas.