采用激光熔覆技术在AZ31B镁合金表面制备Al-Cu合金涂层,研究不同激光功率条件下激光熔覆层成形、组织和性能的差异。结果表明,当激光功率为350 W时,熔覆层表面成形良好,与基体结合良好并无明显的裂纹缺陷。当激光功率过小时,熔覆表面出现金属小球,且熔覆层与基体结合处有明显的裂纹;当激光功率过高时,熔覆层表面会有弧坑裂纹。不同功率下得到的熔覆层对基体的硬度有明显提高,当功率为350 W时,熔覆层的平均显微硬度达到325 HV。 Al-Cu alloy coatings were prepared on the surface of AZ31B magnesium alloy by laser cladding. The differences of forming, microstructure and properties of laser cladding coatings under different laser powers were studied. The results show that when the laser power is 350 W, the surface of the cladding layer is well-formed and well bonded with the substrate without obvious crack defects. When the laser power is too small, the metal ball appears on the cladding surface, and the cladding layer and the substrate have obvious cracks. When the laser power is too high, the surface of the cladding layer will have crater cracks. The hardness of the cladding obtained at different power is obviously improved. When the power is 350 W, the average microhardness of the cladding reaches 325 HV.