针对2 mm厚AZ31B镁合金薄板的旁路耦合电弧焊(DE-GMAW)焊接过程,利用ANSYS软件对其进行有限元分析,得到工件的温度场分布后,进行耦合计算得到工件的DE-GMAW焊接残余应力分布。在焊缝及其热影响区有较高的纵向残余拉应力,最大是72 MPa;在焊接起弧点和熄弧点有较高的横向残余压应力,最大是88 MPa;在垂直于焊缝的中心线上,距离焊缝中心15~25 mm处纵向残余压应力最大,达到45 MPa。 Aiming at the welding process of 2-thick AZ31B magnesium alloy sheet by the way of DE-GMAW welding, the finite element analysis is carried out by using ANSYS software. After the temperature field distribution of the workpiece is obtained, the DE-GMAW welding of the workpiece is calculated Residual stress distribution. In the weld and its heat affected zone has a higher longitudinal residual tensile stress, the maximum is 72 MPa; welding arc starting point and extinction point higher horizontal residual compressive stress, the maximum is 88 MPa; in the vertical weld Of the center line, from the center of the weld 15 ~ 25 mm at the maximum longitudinal residual compressive stress, reaching 45 MPa.