Numerical simulation of influence of process on stress field of electron beam brazing radiator

The measurement of residual stress of electron beam brazing (EBB)is difficult, so a two-dimonsional FEM model was established to simulate the residual stress field by ANSYS softwane.And the influences of two kinds of process on residual stress of 1Cr18Ni9Ti stainless steel radiator joint of EBB were analyzed to optimize the process and parameters.The results show that, for radial residual stress, the obvious stress concentration region was found in faying face by direct-heating process;while there was no stress concentration in faying face by stage-by-stage heating process;For circumferential residual stress, conpared the stage-by-stage heating process with direct-heating process, the peak value of tensile stress reduces by 11.2%.Compared circumferential residual stress with radial residual stress by two kinds of brazing process, the peak value of circumferential tensile stress is higher than that of radial tensile stress.So the dangerous position of faying face is along circle direction, namely, the heating direction of scanning electron beam.