真空中间退火拉拔制备ER5356焊丝MIG焊接头的组织与性能  

Microstructure and Properties of MIG Welded Joint of ER5356 Wire Prepared by Drawing with Vacuum Intermediate Annealing

作　　者：戴宇[1] 张迎迎[1] 王大锋 张龙 马良超 陈东高[1] 何逸凡 DAI Yu;ZHANG Yingying;WANG Dafeng;ZHANG Long;MA Liangchao;CHEN Donggao;HE Yifan(Ningbo Branch of Chinese Academy of Ordnance Science,Ningbo 315103,China)

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《热加工工艺》2022年第21期41-45,共5页Hot Working Technology

摘　　要：在铝合金焊丝拉拔制备过程中,采用真空退火工艺对每道次拉拔后的焊丝进行中间退火处理,然后采用MIG焊接方法和制备的ER5356铝合金焊丝焊接20 mm厚7A52铝合金板,并对焊接接头的组织与性能进行研究。结果表明:采用真空中间退火工艺制备的ER5356铝合金焊丝,焊缝质量达到I级;与大气中间退火制备的焊丝相比,焊缝组织形态和晶粒大小变化较小;真空中间退火制备的焊丝焊接接头力学性能优于大气中间退火制备的焊丝,接头平均抗拉强度为293MPa,平均断后伸长率为5.5%,接头拉伸断裂机制为韧性断裂。The vacuum annealing process was used to perform intermediate annealing treatment for the aluminum alloy wire after each pass drawing during drawing process. The prepared ER5356 aluminum alloy wire was used to weld 7A52aluminum alloy plate with a thickness of 20 mm by the MIG welding method, and the microstructure and properties of the joints were analyzed and studied. The results show that the weld quality of ER5356 aluminum alloy wire prepared by vacuum intermediate annealing process reaches level I. Compared with those of the wire prepared by atmospheric intermediate annealing, the weld structure and grain size have little change. The mechanical properties of the welding joint of the welding wire prepared by vacuum intermediate annealing are better than those of welding wire prepared by atmospheric intermediate annealing, the average tensile strength of the joint is 293MPa, the average elongation after fracture is 5.5%. The tensile fracture mechanism of the joint is ductile fracture.

关 键 词：真空中间退火 铝合金焊丝 MIG焊接 

分 类 号：TG422.3[金属学及工艺—焊接]