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激光深熔焊中小孔的动力学行为对焊接质量具有重要的影响。该文建立了随小孔深度变化的自适应热源模型,应用VOF(volume of fluid)算法跟踪小孔自由表面,对深熔焊小孔形成过程进行了数值模拟,分析了小孔形成过程中孔壁的变化、熔池的流动行为和温度分布。结果表明:液态金属的流动方向随小孔深度的不同发生变化;底部的液态金属在蒸发压力驱使下沿小孔壁面向上流动形成的漩涡可能是小孔壁面不稳定的原因。
Laser deep penetration welding of small holes in the dynamic behavior of the welding quality has an important impact. In this paper, an adaptive heat source model with varying pore depth was established. The volume of fluid (VOF) algorithm was used to track the free surface of the pores. The formation process of the deep penetration weld was numerically simulated. Wall changes, pool flow behavior and temperature distribution. The results show that the flow direction of the liquid metal changes with the depth of the holes. The vortex formed by the bottom liquid metal flowing upward along the wall of the hole driven by the evaporation pressure may be the reason of the instability of the wall of the hole.