试验研究了Q2 35钢相变超塑性扩散焊接过程 ,从中得出工艺参数对焊接接头的影响规律 ,并利用有限元方法研究了焊接接头的变形、应力和应变。模拟结果表明 ,焊缝质量好坏主要取决于界面上拉应力出现的位置以及拉应力的数值大小 ,因而要求工艺参数的合理配合 The phase transition superplastic diffusion welding process of Q235 steel was studied experimentally. The influence of the process parameters on the welded joints was obtained. The deformation, stress and strain of the welded joints were studied by finite element method. The simulation results show that the weld quality is good or bad depends mainly on the location of tensile stress on the interface and the numerical value of tensile stress, which requires reasonable coordination of process parameters