中文摘要：

利用ANSYS软件对厚度为2 mm的AZ31B镁合金薄板的非熔化极气体保护焊（DEGMAW）焊接过程进行有限元分析,利用间接耦合法计算焊件的温度场,分析AZ31B镁合金板焊件残余应力的分布规律,并研究了DE-GMAW旁路电流对焊件熔池尺寸和残余应力的影响规律.结果表明,在焊接总电流和其他焊接参数一定的条件下,随着旁路电流增大,母材的热输入减小,熔深值下降,熔宽值略有降低,焊缝受到的残余拉应力逐渐减小.

英文摘要：

A finite element analysis of the double-electr6ode gas metal arc welding process of a 2 mm AZ31B magnesium alloy sheet was conducted by using the ANSYS software. The indirect coupling method was used to calculate the temperature field, and the residual stresses distribution rule of AZ31B magnesium alloy was analyzed. Then, the influence of DE-GMAW welding current on weld pool size and residual stress was studied. The results show that if the total current is constant and other welding parameters are the same, as the bypass current increases, the weld width and the weld penetration, as well as the welding residual stress decrease because of the decrease in the heat input of the base metal.