基于实验铝合金激光小孔焊熔池表面速度计算

为了解决激光焊接铝合金熔池表面液态金属流动速度量值化问题,结合高速摄影装置与波动理论,提出了计算激光焊焊接过程中铝合金熔池表面液体流速的计算方法.根据有限深度液体流动模型,波速取决于液体波传播的波长以及液体深度这两个物理量,采用高速摄影对焊接过程中熔池的流动形态进行拍摄,得到进行波的波长;对焊缝截面的熔深进行测量得到液体的深度,可以计算熔池表面液体的流动速度.研究表明,在激光束功率为6 kW,焊接速度分别为0.066 7,0.075,0.083 5 m/s的高速焊情况下,熔池表面的流动速度可达0.065 8,0.064,0.072 m/s.

Computing Surface Velocity of Molten Pool Based on the Experiment of Laser Keyhole Welding Aluminum

In order to quantify liquid metal flow surface velocity during laser welding aluminum alloy,a new method was developed to calculate molten pool surface velocity based on high-speed camera equipment system and wave theory.According to the liquid flow model of limited depth,liquid wave propagation velocity depends on two physical quantities: the wavelength and the depth of liquid,which are obtained by observation of high speed camera system and weld cross section,respectively.The results show that when the laser power is 6kW and with high welding speed of 0.066 7,0.075 and 0.083 5 m/s,the weld pool surface speed are 0.065 8,0.064 and 0.072 m/s.