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依据产品几何模型,运用VisualMesh网格划分软件分别建立了网格模型,通过对实际工艺参数和工艺特点的分析,建立了简化的数值模型,考虑了材料随温度变化的热物理性能和对流、辐射换热边界条件,给出了其焊接温度场演变历程和焊缝及其附近热循环曲线。同时实测了催化转换器焊缝附近的焊接热循环曲线,与模拟结果比较,两者基本吻合,证明了焊接温度场模拟结果的可靠性;并通过热-力耦合,将温度场结果施加到应力场,得到了残余应力分布规律,以及焊接变形量大小,与实测结果基本吻合。
According to the geometric model of the product, a mesh model was established by using Visual Mesh meshing software. By analyzing the actual process parameters and process characteristics, a simplified numerical model was established. Considering the thermophysical properties and convection and radiation Heat exchange boundary conditions, given the evolution of the welding temperature field and the weld and its thermal cycle near the curve. At the same time, the thermal cycle curve of the welding near the weld of the catalytic converter was measured. The results are in good agreement with the simulation results, which proves the reliability of the simulation results of the welding temperature field. The thermal field results are applied to the stress Field, the residual stress distribution, and the size of the welding deformation, basically consistent with the measured results.