焊接电流对ZM6镁合金薄壁件焊接接头组织和性能的影响  

Effect of welding current on microstructure and mechanical properties of welded joint in thin-walled parts with ZM6 magnesium alloy

作　　者：冯义成[1] 张令柱 王琴 解东栋 刘东戎[1] 马宝霞[1] 刘洪汇[3] 王德峰[3] 王丽萍[1] 郭二军[1] FENG Yicheng ZHANG Lingzhu WANG Qin XIE Dongdong LIU Dongrong MA Baoxia LIU Honghui WANG Defeng WANG Liping GUO Erjun(School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China Avic Jiangxi Hongdu Aviation Industry Group Co. LTD, Nanchang 330024, China Avic Harbin Dong＇an Engine （Group） Co. LTD, Harbin 150066, China)

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040 [2]中航工业江西洪都航空工业集团有限责任公司,江西南昌330024 [3]中航工业哈尔滨东安发动机(集团)有限公司,黑龙江哈尔滨150066

出　　处：《兵器材料科学与工程》2017年第2期29-33,共5页Ordnance Material Science and Engineering

基　　金：黑龙江省自然科学基金资助项目及(ZD2016011);哈尔滨市科技创新人才资助项目(2016RAQXJ014)

摘　　要：以ZM6镁合金薄壁铸件为研究对象,通过OM、SEM观察和显微硬度以及拉伸性能测试等分析测试手段,研究焊接电流对焊接接头质量的影响规律。研究发现:随着焊接电流的增大,焊缝区的晶粒尺寸减小,显微硬度增大;而焊接接头的抗拉强度随电流的增加呈先缓慢增加后减小的变化趋势;随焊接电流的增大,焊接裂纹的敏感性也随之增加。The welded joint of the thin-walled castings with ZM6 magnesium alloys was prepared by TIG method. The microstructure and mechanical properties of welded joint were characterized by optical microscope（OM）,scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,micro-hardness test and tensile testing method. The experimental results show that grain size of weld zone decreases with increasing welding current,but the micro-hardness increases,and the tensile strength of welded joints increases slowly and then decreases. And with the increase of welding current,welding crack sensitivity also increases.

关 键 词：ZM6 TIG焊 焊接电流 力学性能 

分 类 号：TG44[金属学及工艺—焊接]