通过以ＳＵＳ３０４奥氏体不锈钢与钢１０２珠光体耐热钢采用Ｉｎｃｏｎｅｌ８２焊丝、ＴＩＧ焊接接头为例的模拟加热、检测以及有关试验，探讨了异种钢焊接接头的失效机理。结果认为，高温下长期使用的异质接头，钢１０２侧热影响区表面将产生氧化沟槽，它是接头局部蠕变与优先氧化交互作用的结果。沟槽根部的应力集中容易诱发根部裂纹，加之碳迁移以及附加热应力等因素，促使接头早期断裂。 The failure mechanism of dissimilar steel welded joints was discussed through the simulation heating, testing and the related experiments using SUS304 austenitic stainless steel and steel pearlite heat-resisting steel with Inconel82 welding wire and TIG welded joint as examples. The results show that the long-term use of heterogeneous joints at high temperature, the steel 102 side of the heat-affected zone will produce oxide trenches, which is the joint local creep and preferential oxidation of the interaction results. Stress concentration in the root of the groove easily induces root cracks, combined with carbon migration and additional thermal stress, to promote the early fracture of the joint.