5083/6063异种铝合金MIG焊接接头组织和力学性能  

Microstructure and Mechanical Properties of 5083/6063Dissimilar Aluminum Alloy MIG Welding Joint

作　　者：胡靖元[1] 刘志颖[1] 李培跃 李晟 HU Jingyuan, LU Zhiying, LI Peiyue, LI Sheng(Luoyang Ship Material Research Institute, Luoyang 471023, China)

机构地区：[1]中国船舶重工集团公司第七二五研究所

出　　处：《热加工工艺》2018年第19期237-239,共3页Hot Working Technology

基　　金：河南省重大科技专项项目(MK160801)

摘　　要：对大型铝合金结构件中常用的5083和6063铝合金进行了熔化极氩弧焊（MIG）对接试验,并对焊接接头的显微组织和力学性能进行分析。结果表明：焊缝成形良好,焊缝区为等轴晶组织,5083母材一侧热影响区晶粒较6063母材一侧长大明显;焊接接头抗拉强度为129 MPa,接头的侧弯性能良好,弯曲角度达到180°时,焊接接头无裂纹,符合JB/T 4734-2002《铝制焊接容器》的规定。焊接接头硬度分布因两母材的硬度差异而呈现较大梯度,6063侧的硬度分布变化较大,焊缝与该侧热影响区的最大硬度差值达到35 HV。The butt joining of 5083 and 6063 aluminum alloys commonly used in large aluminum alloy structure was conducted by MIG welding. The microstructure and mechanical properties of the welded joint were analyzed. The results show that the weld forming is good. The microstructure of the weld zone is equiaxed crystal structure. The grain growth in the heat affected zone at the side of 5083 base metal is more obvious than that at the side of 6063 base metal. The tensile strength of the welded joint is 129 MPa. The joint has good bending performance, and there is no fracture in the joint when the bending angle achieves 180°. The performance meets the standard of JB/T 4734-2002 aluminium welded vessels. The hardness distribution of the welded joint shows a large gradient due to the difference of hardness between the two base materials. The hardness distribution at the 6063 side varies greatly, and the maximum hardness difference between the welding seam and the heat affected zone of the 6063 side reaches 35 HV.

关 键 词：熔化极氩弧焊 异种铝合金 显微组织 力学性能 硬度 

分 类 号：TG444.74[金属学及工艺—焊接]