基于数值仿真工具，对某型压力传感器芯体径向脉冲激光焊接过程进行3D建模及仿真分析。模型描述了焊接过程中脉冲激光形成的等效热源，316L不锈钢材料的传热和相变，热影响区形成的瞬态应力场，以及焊接后形成的残余应力。同时，根据多种激光焊接工艺参数组合形成的熔池深度实测数据完成等效热源模型的标定。结果显示：经过标定的等效热源模型熔深计算值与实测值偏差在8%以内；将焊缝残余应力分布计算值与X射线衍射法所得的实测值进行了对比分析，两者结果较为吻合，变化规律一致，偏差值小于15%。验证了激光焊接模型的精度能够满足工艺参数影响规律研究及参数优化的工程需要。

Based on numerical simulation tools, the radial pulse laser welding process of a pressure sensor core is simulated. The model describes the equivalent heat source formed by the laser, heat transfer and phase transformation of 316L, the transient stress field formed by heat affected zone, and residual stress formed after welding. At the same time, according to the measured depth of the molten pool formed by various laser welding process parameters, calibration of the equivalent heat source model is finished, and the deviation values are within 8%. The comparative analysis between the calculated value of residual stress and measured residual stress value by X-ray diffraction method shows that the two results are consistent, and the deviation values are within 15%. It is verified that the engineering needs of study for influence law of process parameters and parameter optimization are met by the accuracy of laser welding model.