Bimetallic composite pipe semiautomatic arc welding method

The present invention discloses a bimetallic composite pipe semiautomatic arc welding, the welding of the first pipe nozzle pretreatment, and then sequentially welding root welding layer, transition layer welding, the welding filler layer and cover layer welding, the present invention provides bimetallic composite pipe semiautomatic arc welding method, to solve the double metal pipe alone caused weld manual welding work is slow, labor intensity, and welding heat input amount and corrosion resistance of the stainless steel layer and other problems, to avoid the conventional filling and capping welding heat input resulting in a large portion of the welding seam sealing the problem of stress concentration, improve the welding quality and welding speed.