压力容器主管道分段焊接变形的数值模拟研究

Numerical Simulation Study on Segmented Welding Deformation of Main Pipe of Pressure Vessel

针对压力容器主管道焊接径向位移过大的问题,采用SYSWELD软件对主管道多层多道焊接进行了数值模拟分析,并研究了3种分段式焊接方案对焊接残余应力和变形的影响。结果表明,计算结果与实验结果较为吻合,验证了数值手段的合理性,采用分段式焊接可有效地降低压力容器主管道焊接过程的径向位移和残余应力,在所研究的3种分段式研究方案中,分段式上下单边焊接方案对焊接径向位移的抑制效果最好。

For the excessive radial deformation problem of the reactor pressure vessel during the welding process,based on SYSWELD,the numerical simulation analysis of the multi-pass welding of a main pipe is conducted,and the effects of three sub-sectional welding schemes on the welding residual stresses and welding deformation are investigated.The results show that,the numerical results are in good agreements in the experimental data,so the numerical approach involved is validated.The sub-sectional schemes can effectively reduce the radial displacements of the pressure vessel main pipe during the welding process.Among the three welding schemes,the sub-sectional up-to-down single-side scheme shows the best effect on the welding radial deformation suppression.