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以固液相变的统一模型方程为基础,计算了激光焊接与表面重熔不同加热模型条件下,液态熔池的形成过程,以及温度场和流场.主要考察了激光诱导的合金元素汽化和表面张力驱动流对自由表面温度分布及熔池形状的影响.结果发现,熔池自由表面温度和溶池形状主要受表面张力驱动的流体流动的影响,它在限制自由表面最高温度方面起着主要作用,合金元素汽化热损失的影响是第二位的.熔池的形状主要受液态金属涡旋方向的影响,在负的表面张力温度系数条件下,熔池浅而宽;在正的表面张力温度系数下,熔池深而窄.
Based on the unified model equations of solid-liquid phase transition, the formation process of liquid pool, temperature field and flow field under different heating models of laser welding and surface remelting were calculated. The effects of laser-induced alloying and Surface tension driven flow on the free surface temperature distribution and the shape of the weld pool.The results show that the weld pool free surface temperature and the shape of the weld pool mainly by the surface tension-driven fluid flow, which limits the free surface maximum temperature plays a major The effect of heat loss on the vaporization of the alloying elements is second.The shape of the weld pool is mainly affected by the vortex direction of the liquid metal and the weld pool is shallow and wide under the condition of negative surface tension temperature coefficient, Temperature coefficient, the pool deep and narrow.