舰船用6082铝合金TIG焊组织与力学性能分析

Microstructure and mechanical properties of weld joint of marine 6082 aluminum alloy By TIG welding

采用ER4043和ER4047焊丝,对厚度为12 mm的舰船用6082铝合金进行了TIG焊接试验研究,测试了焊缝强度并对其显微组织进行了观察分析.结果表明,在采用文中推荐的焊接参数条件下,使用Al-Si系焊丝的焊接接头力学性能优良,焊缝区组织为树枝状晶的铸态组织,熔合区出现异于焊缝中心的胞状晶;热影响区受焊接热循环作用组织有所粗化.使用ER4043焊接的接头抗拉强度略低于使用ER4047的接头,但塑性相对较好并且生成大气孔的倾向相对较低.

Marine 6082 aluminum alloy of 12mm thick plate was welded by TIG welding with ER4043 and ER4047 as consumables,and the microstructure of the joints and the tensile strength of weld joints were studied.Results indicate that with the recommended welding parameters,the weld joints possessed high tensile strength with Al-Si welding wires,and the microstructure of the weld was as cast microstructure of dendrite,which was different with the cellular crystal of the fusion zone.The crystalline grain in the HAZ was slightly coarsened by the influence of the welding thermal cycles.The tensile strength and the tendency of forming large pores of the ER4043 weld joint was relatively lower than the ER4047 joint,but the ductility of joint welded with ER4043 was better.