采用IPG YLS-6000光纤激光器和Slab DC035CO2激光器,在近似相同的工艺条件下进行平板扫描焊接,通过Olympus光学显微镜测量焊缝横截面积,并计算熔化效率。结果表明:两种激光器焊接的熔化效率均随焊接速度先增加后减小,但是光纤激光焊接熔化效率峰值所对应的焊接速度要远远高于CO2激光焊接。进一步分析表明两种激光焊接熔化效率的差异与激光能量耦合的固有规律不同有关。因此,从焊接效率上考虑,光纤激光器更适合于高速焊接,而CO2激光器更适合于低速焊接。 Plate scanning welding was performed under approximately the same process conditions using an IPG YLS-6000 fiber laser and a Slab DC035CO2 laser, the weld cross-sectional area was measured by an Olympus optical microscope, and the melting efficiency was calculated. The results show that the melting efficiency of the two kinds of laser welding increases first and then decreases with the welding speed, but the welding speed corresponding to the peak of fiber laser welding melting efficiency is much higher than that of CO2 laser welding. Further analysis shows that the difference between the two types of laser welding melting efficiency is related to the inherent laws of laser energy coupling. Therefore, considering the welding efficiency, fiber lasers are more suitable for high-speed welding, and CO2 lasers are more suitable for low-speed welding.