Arc welding of stainless steel pipe technology requirements penetration penetration, non-oxide inclusions, heat affected zone as small as possible. Tungsten inert gas shielded arc welding has good adaptability, high welding quality, performance and penetration, and its products in the chemical industry, nuclear industry and food industry and other fields has been widely used. TIG welding speed deficiency is not high. In order to improve the welding speed, research and development of some foreign companies a variety of methods.