焊接功率对焊件焊后应力应变的影响

The influence of welding power on post-weld stress strain of weldments

为研究焊接功率对复杂焊件焊后应力、变形大小和分布的影响,通过Visual-Environment软件平台建立实体模型,使用SYSWELD焊接软件作为求解器对Q345低合金钢在焊接工艺中选取不同焊接功率来进行仿真模拟.结果表明:1 680 W焊接功率的为残余应力、变形为3组方案中的最小值,最大残余应力发生在第一条焊缝的开始处,达到596.83 MPa,最大角变形位置在顶板边缘,变形达到2.225 mm.仿真模拟发现:与实际2 100 W焊接工艺对比最大角变形值减小了18.6%.保证其余焊接参数保持不变,焊接功率越大,焊缝变形程度越大.降低焊接变形的方法之一是控制焊接合理地功率.通过夹具体的数值模拟结果可以为后续实际生产焊接工艺提供可靠依据.

To study the influence of welding power on post-weld stress,deformation size and distribution of complex weldments,the solid model of the welding workpiece was established by the Visual-Environment software platform,and the SYSWELD welding software was used as a solver to simulate Q345 low-alloy steel by selecting different welding powers in the welding process.The results show that the residual stress and deformation generated by the welding power of 1680 W are the minimum among the three schemes,and the maximum residual stress 596.83 MPa occurs at the beginning of the first welding process.The maximum angular deformation position is at the edge of the top plate,the deformation reaches 2.225 mm.The result of our simulation shows that the maximum angle deformation value decreases by 18.6%compared with the actual 210 W welding process.To ensure that the remaining welding parameters remain unchanged,the greater the welding power is,the greater weld deformation is.One of the ways to reduce the welding deformation is to control the welding power.The results of the specific numerical simulation of the clamp can provide a reliable basis for the subsequent actual production of welding process.