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采用Level-set方法模拟了激光深熔焊接过程中光致等离子体的动态形成过程,研究了等离子体形态、温度、孔内压强、气体流速等行为特征。结果表明:在2.2ms时刻等离子体的最高温度达到4 300K,孔内的最大压强为4×105 Pa,等离子体在小孔径向的最大流速为60m/s,最大流速位于等离子体中心处且接近孔底的位置,且等离子体沿小孔轴线方向与径向方向的流速下降。考虑等离子体对激光能量吸收比未考虑等离子体对激光能量吸收时孔内功率密度降低了12.5%。研究结果将为激光深熔焊接过程中等离子体的机理研究和模拟研究提供理论依据。
The Level-set method was used to simulate the dynamic process of laser induced plasma during deep-penetration laser welding. The behavior of plasma such as plasma morphology, temperature, pore pressure and gas velocity were studied. The results show that the maximum plasma temperature reaches 4 300 K at 2.2 ms, the maximum pressure in the pore is 4 × 105 Pa, the maximum plasma flow velocity in the radial direction of the orifice is 60 m / s, the maximum flow velocity is at the plasma center and approaches The position of the bottom of the hole, and the flow rate of the plasma in the axial direction and the radial direction of the orifice is decreased. Considering that the plasma absorbs the laser energy is 12.5% less than the power density inside the hole when the plasma absorbs the laser energy without considering the plasma. The results will provide a theoretical basis for the mechanism and simulation of plasma during laser deep-penetration welding.