TIG welding method for improving welding speed of ferritic stainless steel and protective gas mixing apparatus

摘要

The present invention relates to a TIG welding method of ferritic stainless steel, and specifically, by using a protective gas in which an appropriate amount of H ₂ or O ₂ is mixed with Ar gas, which is a basic protective gas, compared to the case where only pure Ar gas is used. The present invention relates to a TIG welding method for improving the welding speed of ferritic stainless steel that can improve the welding speed without degrading workability. In addition, the present invention relates to a gas mixing device provided with a gas flow rate control unit which limits the content of the H ₂ and O ₂ and controls mixing with Ar gas by a limited amount. To this end, the present invention is a TIG welding method of ferritic stainless steel using a protective gas consisting of Ar gas, the protective gas is mixed with Ar gas by H ₂ 0.5 to 1.5% by weight or O ₂ 0.01 to 0.1% by weight It is characterized by consisting of a mixed state.;Ferritic stainless steel, TIG welding, welding speed, protective gas