Analysis on single and double wire welding technology of 7A52 aluminum alloy

The thick plate of 7A52 aluminum alloys were welded by single and double wire gas shielded arc welding with ER5356 filler.The distortion of the welded joints is analyzed.The microstructure, hardness and tensile-strength of single and double wire welded joints are studied.The comparison between single and double wire welding show that the distortion of the double wire welded joint is smaller, the microstructure of double wire welded metal is tighter than the single one, the heat-affected zone is narrower, and the hardness is higher.The tensile strength increase by 7.7% compared to single wire welding.Energy spectrum analysis shows that the volatilization of Zn could be restrained by using double wire welding.