镁合金/不锈钢激光-TIG复合焊的数值分析  

Numerical analysis of residual stress on magnesium alloy and stainless steel butt joint by hybrid laser-TIG welding

作　　者：李迅波[1] 吴刚[1] 曾志[1] 王锦夏 赵刚 

机构地区：[1]电子科技大学机械电子工程学院,成都611731 [2]成都焊研威达自动焊接设备有限公司,成都610300

出　　处：《焊接学报》2011年第8期49-52,115,共4页Transactions of The China Welding Institution

基　　金：成都市科技攻关计划重点基金资助项目(09GGZD297GX)

摘　　要：应用Nd:YAG激光-TIG(非熔化极氩弧焊)复合焊接技术对AZ31B镁合金板和304L不锈钢板进行异种材料对接焊.根据复合焊接的能量耦合机理,建立了基于双椭圆平面分布、双椭球体积分布和旋转-高斯体积分布相结合的复合焊接热源模型,利用有限元数值模拟,分析了复合焊接温度场及残余应力分布.结果表明,对异种材料而言,焊缝处温度场差别较大,且镁合金侧的残余应力较高.The AZ31B magnesium alloy and 304L stainless steel butt joint were obtained in laser-TIG hybrid welding.A new coupled heat source model was developed,which combined by double-elliptic planar distribution,double-ellipsoid body distribution and Rotary-Gauss body distribution model.The thermo-mechanical behavior and residual stresses distribution of the butt joint were analyzed by using finite element techniques.The results show that the temperature distribution of the dissimilar metal hybrid weld joint is different,and the residual stress on the 304L stainless steel plate is lower than that on the AZ31B magnesium plate.

关 键 词：镁合金 不锈钢 复合焊接 残余应力 

分 类 号：TG403[金属学及工艺—焊接]