以T91钢管为研究对象,基于试验结果对其环焊热源模型做校准处理,使用SYSWELD数值模拟软件对整个焊接过程进行了模拟计算,分析了焊接接头在焊接过程中的温度、应力等变化,对焊后的残余应力进行了预测。结果表明:最大残余应力位于距焊缝中心5~10 mm的部位,即热影响区外侧,而最小残余应力位于母材区。在多层焊接过程中,随着焊接层数的递增,残余应力峰值部位转移至外侧的热影响区。 Taking T91 steel as the research object, the welding heat source model was calibrated based on the experimental results. The whole welding process was simulated by using SYSWELD numerical simulation software. The changes of temperature and stress during the welding process were analyzed. Residual stress after welding was predicted. The results show that the maximum residual stress is located 5 ~ 10 mm away from the weld center, ie outside the heat affected zone, while the minimum residual stress is located in the base metal zone. In the multi-layer welding process, as the number of welding layers increases, the peak of residual stress shifts to the outside heat-affected zone.