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核电设备由于其复杂的服役环境,不同位置对材料提出不同要求,因此大量使用了异质金属堆焊。本文为研究异质金属堆焊接头温度场和焊接残余应力的分布规律,基于有限元分析软件ABAQUS,开发了用于模拟平板堆焊接头温度场、应力场的热-弹-塑性有限元计算方法。计算结果表明,所开发的基于高斯面热源的移动热源模型很好地拟合了实际生产时的熔池形态;同时由于材料性能的差异,在界面上存在明显的残余应力不连续的现象;在多道焊条件下后焊焊道对先焊焊道有一定的退火作用,可以适度降低先焊焊道时形成的残余应力。
Nuclear power equipment due to its complex service environment, different locations on the material made different requirements, so extensive use of heterogeneous metal surfacing. In order to study the distribution of temperature field and welding residual stress in heterogeneous metal surfacing joint, a thermo-elastic-plastic finite element method (FEM) for simulating the temperature field and stress field of the flat surfacing welding joint was developed based on finite element analysis software ABAQUS . The calculation results show that the developed mobile heat source model based on Gaussian surface heat source fits well the shape of the molten pool in practical production. At the same time, there is obvious residual stress discontinuity at the interface due to the difference of material properties. After the multi-welding conditions, the back-weld bead has a certain degree of annealing on the first weld bead, which can moderately reduce the residual stress formed when the first weld bead is welded.