摘要
采用脉冲熔化极惰性气体保护焊(MIG)方法进行了国产A6N01铝合金的焊接,研究了焊接接头的力学性能和微观组织等,结果表明:焊接接头成形良好,焊态抗拉强度为198MPa,断后伸长率为7.0%,断口位于焊缝。焊接接头的显微硬度以焊缝中心最低。焊缝熔敷金属为等轴晶状的铸态组织,靠近母材的熔合区形成了一层较薄的细小等轴状组织,焊接热影响区的部分强化相Mg2Si固溶到基体中。
A6N01 Al alloy was welded by pulsed MIG welding.The mechanical properties and microstructure were investigated.The results of experiments show that the weld appearance is fine.The tensile strength of joint under the welding conditions is 198 MPa,and the percentage elongation after fracture is 7.0%.The zone of fracture is located in the weld metal.The microhardness on center of welding metal is the lowest in joint.The microstructure of weld metal is equiaxial structure as cast metal,and HAZ near weld metal is tiny equiaxial structure of a thin layer.Some Mg2Si phases have been solid solution into the base metal.
出处
《焊接》
北大核心
2008年第9期33-35,共3页
Welding & Joining
