LIU Guoting, WANG Zhuoran, CHAI Fei, et al. Application of variable polarity plasma arc welding in girth welding of shell and flange. [J]. 51(11):77-81(2021)
DOI:
LIU Guoting, WANG Zhuoran, CHAI Fei, et al. Application of variable polarity plasma arc welding in girth welding of shell and flange. [J]. 51(11):77-81(2021) DOI: 10.7512/j.issn.1001-2303.2021.11.14.
Application of variable polarity plasma arc welding in girth welding of shell and flange
The technological characteristics of variable polarity plasma arc welding(VPPAW) of aluminum alloy are analyzed. The penetrating variable polarity plasma arc butt girth welding experiment of anti-rust aluminum alloy 5 A06 with thickness of 7 mm is carried out by using ER5356 welding wire.The influencing factors of weld forming quality are analyzed,and the application of variable polarity plasma arc welding to shell-flange girth welding in an underwater product is realized.The welding process is divided into six stages: arc-striking,perforating, welding, lapping, hole-closing and arc-extinguish.The quality and mechanical properties of the joint are tested by X-ray diffractometer and universal stretcher. The results show that the girth weld of 5 A06 aluminum alloy shell and flange is well formed. The weld quality meets the requirements of grade I weld of GJB 294 A-2005 "Fusion Welding of Aluminum and Aluminum Alloys". The tensile strength of the joint is 301 MPa,which is 90.2% of the base material. The fracture position is near the bond line. The mechanical properties of the joint are good and meet the requirements of the product.