焊接接头是由母材区、热影响区和焊缝组成的材质和力学性质非均匀体,与均匀材料相比,有关非均匀体低周疲劳特性的研究还相当少,许多问题尚未完全搞清.本文通过16MnR压力容器用钢焊接接头的应变控制低周疲劳试验,采用宏观试验与微观分析相结合的方法,考虑了焊接接头材质和力学非均匀性的影响,对其疲劳特性进行了较为深入的研究,得出一些新的十分有意义的结论. Welding joints are made of base material, heat-affected zone and weld seam material and mechanical properties of non-uniform body, compared with the homogeneous material, the research on low-cycle fatigue characteristics of non-uniform body is still relatively small, many problems have not been fully understood In this paper, by means of the strain controlled low cycle fatigue test of 16MnR steel pressure vessel welded joint, the macroscopical test and microscopic analysis are combined to consider the influence of the material and mechanical inhomogeneity of welded joint, and its fatigue characteristics are further studied Research, come to some new very meaningful conclusions.