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以LF6铝合金作为实验材料,采用搭接的方式进行激光点焊实验,研究了激光功率、点焊持续时间对点焊过程和焊点尺寸的影响规律。实验结果表明:激光功率较低时,形成的焊点尺寸有较大差异,点焊过程受工件表面状态的影响而存在不稳定性;激光功率较大时,容易引起等离子体的膨胀,导致到达工件表面的能量大大减低。激光功率主要影响焊点的熔透状态,而对焊点尺寸影响很小;点焊持续时间主要影响焊点的整体尺寸,焊点表面、熔合面和背面直径均随着点焊时间的增加而近似线性增加,其中焊点背面尺寸增加速度最快;点焊时间对焊点表面下塌的影响较激光功率更大。
LF6 aluminum alloy was used as the experimental material, lap welding laser spot welding experiment was carried out to study the influence of laser power and spot welding duration on spot welding process and spot size. The experimental results show that when the laser power is low, the size of the solder joint formed is quite different. The spot welding process is unstable due to the surface condition of the workpiece. When the laser power is large, it is easy to cause the plasma to swell, The surface of the workpiece greatly reduced energy. The laser power mainly affects the penetration state of the solder joints, but has little effect on the solder joint size. The duration of the spot welding mainly affects the overall size of the solder joint. The solder joint surface, the fusion surface and the back diameter are both increased with the spot welding time The approximate linear increase, in which the size of the back of the solder joints to increase the fastest; spot welding time on the solder joint surface collapse than laser power greater.