激光感生等离子体特性的三维数值模拟

THREE-DIMENSIONAL MODELING OF THE LASER-INDUCED PLASMA PLUME CHARACTERISTICS IN LASER WELDING

在激光焊接过程中,作用于金属工件表面的高强度激光会引起材料的强烈蒸发,金属蒸汽与入射激光相互怍用,又会引起金属蒸汽部分电离,形成激光感生等离子体。本文采用三维模拟方法,考虑保护气和侧吹气的影响,对激光感生等离子体中的温度与速度分布进行了研究。

In laser welding processes, laser beam is focused on the surface of a metallic workpiece with a sufficient high energy flux, causing localized evaporation of the workpiece material. The metal vapor will be partially ionized due to its interaction with the incident laser beam, resulting in the formation of laser-induced plasma. The laser-induced plasma plume characteristics have been studied by use of a 3-D modeling approach including the effects of the coaxially and laterally injected gases on the plasma plume. Typical computed results are presented concerning the temperature and velocity distributions within the plasma plume.