采用CO2激光对三种镁合金AZ31、NZ30K、ZK60进行焊接,并通过光学显微镜、扫描电镜、能谱仪及拉伸试验机对其焊接接头的微观组织和力学性能进行了分析和测试。结果表明,异种镁合金采用激光焊接均能得到良好的焊缝,其焊接接头的抗拉强度均小于母材的抗拉强度。元素分析表明,接头熔合区均存在明显的元素浓度梯度分布。 The CO2 laser was used to weld the three kinds of magnesium alloys AZ31, NZ30K and ZK60. The microstructure and mechanical properties of the welded joints were analyzed and tested by optical microscope, scanning electron microscope, energy dispersive spectrometer and tensile tester. The results show that the weld of dissimilar magnesium alloy can be well welded by laser welding, the tensile strength of welded joint is less than the tensile strength of base metal. Elemental analysis shows that there is a clear gradient of element concentration in the fusion zone.