焊丝成分对2519铝合金焊缝组织与性能的影响

Effect of welding wire compositions on microstructures and mechanical properties of welded joint of 2519 aluminum alloy

摘要: 采用ER4047焊丝及ER2319焊丝对2519铝合金进行熔化极惰性气体保护焊(MIG),并对焊接接头的力学性能和焊缝组织进行了分析。结果表明,用ER2319焊丝焊接的焊接接头的力学性能优于ER4047焊丝;ER2319焊丝细化了焊缝区的组织;2519铝合金焊接接头的抗拉强度低于母材,焊缝处是焊接接头的最薄弱环节,其次是焊接热影响区内的软化区,θ'相粒子受热影响而粗化是形成软化区的主要原因。

Abstract: 2519 aluminum alloy was welded using ER4047 and ER2319 welding wire with the method of MIG welding.Mechanical properties and microstructures of welded joint were studied.The results show that the weldability of the 2519 aluminum alloy with ER2319 welding wire is better than that with ER4047 welding wire; the microstructures of weld metal is more refined with ER2319 welding wire than that with ER4047;The mechanical properties of welded joint is worse than that of base metal, the weld zone is the weakest point of welded joint, The soften zone in heat-affected zone(HAZ)is the second weakest zone of welded joint, which is formed due to the overaging of the main strengthening phase particles leading to coarsening.