脉冲MIG焊对7N01铝合金焊接接头组织及力学性能的影响  

Effect of Microstructure and Mechanical Properties of Welded Joint of 7N01 Alloy by Pulse MIG Welding

作　　者：高宝杰[1] 吉华[2] 樊云杰[2] 陈辉[2] 吴沛沛[1] 

机构地区：[1]南车青岛四方机车车辆股份有限公司,山东青岛266000 [2]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《热加工工艺》2012年第15期138-140,共3页Hot Working Technology

基　　金："十一五"国家科技支撑计划项目(2009BAG12A04-B03)

摘　　要：采用金相、硬度、拉伸和微型剪切试验研究了7N01S-T5铝合金单脉冲MIG焊、双脉冲MIG焊和超微弧焊三种焊接工艺条件下焊接接头的组织及力学性能。结果表明,焊接热影响区晶粒长大,且析出强化相出现在晶界处;双脉冲MIG焊焊接接头系数高于单脉冲焊和超微弧焊,超微弧焊接接头韧性优于单脉冲和双脉冲焊接接头。Signal pulse MIG welding, double pulse MIG welding and ultrafine arc welding for 7N01 alloy were carried out, and then the microstructure and mechanical properties of the welded joint of 7N01 A1 alloy were investigated by metallographic analysis, hardness test, room temperature tensile, and micro-shear test. The results show that the grain growth in welding HAZ emerges and dispersedly separates in strengthening phase aggregate on the boundaries. The joints coefficient of double pulse is higher than that of signal pulse and ultrafine arc welding, however, the toughness of ultrafine arc welded joints is superior to signal pulse and double pulse MIG welding.

关 键 词：7N01铝合金 熔化极惰性气体保护焊(MIG焊) 显微组织 力学性能 

分 类 号：TG457.14[金属学及工艺—焊接] TG444.72