Patent ID: 9505075
Filing Date: 2016-11-29
CPC Classification: B23K

Claim Text:
1. A TIG welding method for a ferrite stainless steel sheet, wherein the method uses a welding torch, and the welding torch includes: an electrode which has a tip which generates arc; a first shield nozzle which surrounds the electrode; and a second shield nozzle provided at the outside of the first shield nozzle; wherein a first shield gas is supplied from the inside of the first shield nozzle toward the tip of the electrode, a second shield gas is supplied from an area between the first shield nozzle and the second shield nozzle toward the tip of the electrode; the first shield gas is a mixed gas which is a mixture of argon gas and helium gas, wherein 20 to 90% by volume of helium is included in the mixture, and the flow velocity S the second shield gas consisting essentially of argon gas, and the flow velocity S