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.
Of these, by a single electrode into a single multi-electrode welding torch welding torch welding method more than the 20th century, Germany’s first of 70 multi-seam welding torch along the direction of straight line, forming a long-shaped heat distribution, significantly improve the welding speed; have adopted three-electrode arc welding torch, welding steel thickness of the stainless steel pipe 2mm, single-torch welding speed increased more than 3 to 4 times, welding quality has been improved. TIG and plasma welding used in combination with a greater wall thickness can be welded steel pipe. In addition, the use of 5% argon 10% hydrogen, then using high-frequency pulse welding power source, can also increase the welding speed. Multi-arc welding torch for welding of austenitic and ferritic stainless steel tube.