焊接过程温度场、应力场一直是人们所关注的问题之一。本文采用相似准则,利用有限元法对磨机筒体最后一道盖面层焊进行分析。在热分析中采用Gauss分段移动热源模型,考虑了材料热物理和力学性能参数与温度的非线形关系,建立了焊接过程的物理模型,依据给定的焊接工艺参数,应用ANSYS软件实现了盖面层焊的三维动态模拟,得出了焊接温度场和残余应力的大小和分布规律。 Welding temperature and stress field has always been one of the concerns of people. In this paper, the similarity criterion is used to analyze the last cover welding of mill barrel by finite element method. In the thermal analysis, the Gauss model was used to move the heat source model. The non-linear relationship between the thermophysical and mechanical properties of the material and the temperature was considered. The physical model of the welding process was established. According to the given welding parameters, The three-dimensional dynamic simulation of the surface layer welding, obtained the welding temperature field and the residual stress of the size and distribution.