AZ61镁合金/DP590镀锌钢异种金属TIG熔钎焊工艺研究  

Study on TIG Welding-Brazing Process of AZ61 Magnesium Alloy/DP590 Galvanized Steel Dissimilar Metals

作　　者：江莉[1] 刘辉[2] JIANG Li;LIU Hui(School of Meehatronics Engineering,Xinjiang Vocational University,Urumqi 830013,China;Department of Mechanical and Electrical Engineering,Xinjiang Career Technical College,Kuitun 833200,China)

机构地区：[1]新疆职业大学机械电子工程学院,新疆乌鲁木齐830013 [2]新疆应用职业技术学院机电工程系,新疆奎屯833200

出　　处：《热加工工艺》2018年第15期232-235,共4页Hot Working Technology

基　　金：新疆维吾尔自治区高校科研计划项目(XJEDU2014S074)

摘　　要：以AZ31镁合金焊丝为填充材料,采用TIG熔钎焊工艺对AZ61镁合金和DP590镀锌钢板进行了连接。结合光学显微镜、扫描电镜以及拉伸试验机等研究了焊接电流对接头微观组织和力学性能的影响。结果表明,当焊接电流较小时,接头钎焊区域存在大量未被焊合的孔洞和缝隙,接头结合强度较低。随着焊接电流增大,镁/钢界面有均匀、连续的钎焊反应层生成。当焊接电流为80 A时,接头具有最大的剪切强度243 MPa,断裂发生在接头熔焊区,断口表现为典型的塑性断裂特征。The AZ31 magnesium alloy welding wire was used as filler material, AZ61 magnesium alloy and DP590 galvanized steel sheets was connected by TIG welding-brazing technology. The effects of welding current on the microstructure and mechanical properties of the joints were investigated by optical microscope（OM）, scanning electron microscope（SEM） and universal tensile testing machine. The results show that, when the welding current is small, there are a large number of pores and gaps in the brazing zone of the joint which are not welded, and the bonding strength of the joint is low. With the welding current increasing, homogeneous and continuous brazing reaction layer forms at the interface of Mg/steel joint. When the welding current is 80 A, the joint has the maximum shear strength of 243 MPa, and the fracture occurs in the weld zone of the joint, and the fracture shows typical plastic fracture characteristics.

关 键 词：AZ61镁合金 DP590镀锌钢 TIG熔钎焊 

分 类 号：TG444.74[金属学及工艺—焊接] TG454