The dynamic behavior of molten pool and keyhole is highly related to the parameters of welding process. The current study adopted a three-dimensional numerical model to investigate the effect of laser power on the flow field, which under the condition of considering the keyhole and molten pool dynamic behaviors in Laser-MIG hybrid welding. On this basis, the influence mechanism of laser power on the keyhole morphology, velocity field of molten pool and fluid flow behavior was analyzed comprehensively. The model incorporates consideration of the influence of surface tension, recoil pressure, the Marangoni force, electromagnetic force, buoyancy, etc. The transfers of heat, mass and momentum caused by liquid flow and droplet transfer were considered. The simulation results indicated that the depth of keyhole was mostly impacted by the laser power. The increase of laser power was beneficial to obtain weld seam with larger depth-to-width ratio. Moreover, the fluid flow around the keyhole became more intense and rapid gradually when the laser energy was increased.

熔池和锁孔的动态行为与焊接工艺参数高度相关。目前的研究采用三维数值模型来研究激光功率对流场的影响，这是在考虑激光-MIG混合焊接中的小孔和熔池动态行为的条件下进行的。在此基础上，综合分析了激光功率对锁孔形貌，熔池速度场和流体流动行为的影响机理。该模型考虑了表面张力，反冲压力，马兰戈尼力，电磁力，浮力等的影响。考虑了由液体流动和液滴转移引起的热量，质量和动量的转移。仿真结果表明，钥匙孔的深度主要受激光功率的影响。激光功率的增加有利于获得深宽比更大的焊缝。此外，随着激光能量的增加，锁孔周围的流体流动逐渐变得更加强烈和迅速。