7A52铝合金单双丝焊工艺对比分析

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

摘要: 采用ER5356焊丝对7A52铝合金厚板进行单、双丝气体保护焊工艺对比。对单双丝焊焊接接头的变形、显微组织、焊缝硬度和拉伸性能进行了试验分析。结果表明,双丝焊焊接接头变形小;双丝焊焊缝与单丝焊焊缝相比,组织更为细小致密,热影响区较窄;焊缝区硬度高于单丝焊焊缝;焊缝抗拉强度比单丝焊焊缝提高了7.7%。由能谱分析得知采用双丝焊工艺可抑制锌的挥发。

Abstract: 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.