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依据实际激光深熔焊接过程,考虑高温光致等离子体对工件表面的加热而采用高斯面状热源,考虑深熔焊中特有的小孔吸收而采用圆柱状体热源,建立了高斯面热源和圆柱体热源的组合焊接热源模型。考虑表面张力、蒸气反冲压力及热浮力等,建立了激光深熔焊熔池的三维模型,获得焊接过程中瞬态温度场和流场分布以及熔池最高温度和熔深的瞬态变化。焊缝横截面的模拟值和实验值吻合良好,从而证明了该数学模型的合理性。
According to the actual deep penetration laser welding process, the Gaussian surface heat source was considered considering the heating of workpiece surface by high temperature photoplasma, the cylindrical heat source was taken into account for the absorption of small holes in the deep penetration welding, and the Gaussian surface heat source and cylinder Body heat source combined welding heat source model. Considering the surface tension, the recoil pressure of steam and the thermal buoyancy, a three-dimensional model of the deep penetration laser welding pool was established. The transient temperature field and the flow field distribution during welding and the transient changes of the maximum temperature and penetration depth were obtained. The simulation results of the cross-section of the weld are in good agreement with the experimental data, which proves the rationality of the mathematical model.