通过建立磁控GTAW电弧热源模型,同时考虑材料物理性能随温度的变化和相变的影响,以及运用生死单元技术处理熔池的熔化与凝固,对有无外加磁场作用GTAW焊接接头温度场及残余应力的大小分布进行了有限元模拟。结果表明,相较于无外加磁场作用,磁控GTAW焊件最大纵向残余应力下降12.3%,最大横向残余应力下降了13.6%。采用小孔法对焊件残余应力进行测量,模拟结果与试验结果基本吻合。 By establishing a magnetron GTAW arc heat source model, taking into account the physical properties of the material with the temperature changes and phase changes, as well as the use of life and death cell technology to deal with melting and solidification of molten pool, with or without applied magnetic field GTAW welded joints temperature field and residual The size distribution of stress was simulated by finite element method. The results show that the maximum longitudinal residual stress decreases by 12.3% and the maximum transverse residual stress decreases by 13.6% compared with no applied magnetic field. Using the hole method to measure the residual stress of the weldment, the simulation results are in good agreement with the test results.