摘要
用ER5556和ER5356焊丝对AA7075-T651铝合金板材双脉冲MIG焊缝组织与性能进行研究。结果表明:两种焊丝接头焊缝区均为铸态枝晶组织,与ER5556相比ER5356焊丝焊接接头热影响区的晶界有更多第二相析出;ER5556焊丝焊接接头最低硬度为90.6 HV,接头抗拉强度为342.5 MPa,伸长率为8.5%;ER5356焊丝焊接接头最低硬度为80.8 HV,接头抗拉强度为292.5 MPa,伸长率为3.5%;ER5556焊丝接头拉伸断口上有明显的撕裂棱。
Mechanical property and microstructure of welded joint of AA7075-T651 sheets were investigated by using ER5556 and ER5356 welding wires with the method of double pulsed MIG （DP-MIG） welding. The results show that the typical cast dendrite is obtained in the weld seam zone of the joints with the two types of welding wires. Compared with ER5556 welding wire, more second phases precipitate at grains boundaries at heat affected zone of the joint with ER5356 welding wire. The lowest hardness of the joint welded with ER5556 welding wire is 90.6 HV, the tensile strength is 342.5 MPa, and the elongation is 8.5%. The lowest hardness of the joint welded with ER5356 welding wire is 80.8HV, the tensile strength is 292.5MPa, and the elongation is 3.5%. There is an obvious tearing ridge in the tensile fracture surface of the joint welded with ER5556 welding wire.
作者
刘长军
孙佳
张威
张天明
刘政军
LIU Changjun SUN Jia ZHANG Wei ZHANG Tianming LIU Zhengjun(School of Material Science and Engineering, Shenyang University of Technology, Shenyang110870, China School of Chemical Equipment, Shenyang University of Technology, Liaoyang 111000, China)
出处
《热加工工艺》
CSCD
北大核心
2016年第19期203-205,共3页
Hot Working Technology
