Double-side,two-men vertical welding procedures for small-diameter cryogenic aluminum alloy pipelines

In order to solve the double-side welding problems for small-diameter (φ 200～φ 600 mm) cryogenic aluminum pipelines and increase its welding quality and efficiency,this thesis analyzed the commonly-used materials and structures of small-diameter aluminum pipelines for ASP (air separation plants) and selected corresponding welding materials.By adopting manual gas tungsten arc welding method,and two men,double-side simultaneous arc-shaping vertical welding procedures,selecting the synchronous paired inverter AC/DC square-wave argon-arc welding equipment,utilizing the special tailor-made outfit and lengthening welding handles,through controlling the arc-striking,welding synchronism,wire-filling opportunity,welding sequence and welding specifications etc.,the double-side welding problems of small-diameter aluminum pipelines is therefore solved;also the frequent defects of aluminum alloy welding are eliminated and the welding quality and efficiency are greatly increased.