PAW Welding Procedure and Joint Property of S22053 Duplex-stainless Steel

The welding procedure test of S22053 duplex-stainless steel is performed by the keyhole PAW,the keyhole PAW+ auto-GTAW with filler metal for cover pass and the keyhole PAW+ auto-GTAW with filler metal for cover pass+auto-GTAW without filler metal for root pass in order to study service and welding characteristic of duplex-stainless steel as well as PAW suitability.The quality,properties and structure of these joints are analyzed by nondestructive examination,tension,bend,low-temperature impact as well as metallographic tests.These joints made by three welding procedures show higher tension strength than S22053 base metal,and excellent ductility,toughness and corrosion resistance,which meets the requirement of service characteristic for duplex-stainless steel. Compared with the PAW joint,the toughness and corrosion resistance of the joint welded by auto-GTAW with the filler metal after PAW weld decrease to a certain degree.