采用冷金属过渡（CMT）熔钎焊工艺对6061铝合金和Q235镀锌钢异种材料进行了对接焊，并对焊接接头的显微组织和拉伸性能进行了研究。结果表明：焊接接头表面成形质量良好；焊接接头由熔化区、热影响区和界面层等3部分构成；熔化区组织由α-Al固溶体和铝硅共晶组织组成，热影响区组织较母材的发生了粗化，界面层形成了金属间化合物（IMCs），界面层厚度约为8 μm，且界面层向熔化区单向生长；6061铝合金母材侧的焊接热影响区的硬度最低（42 HV），界面层的硬度最高（365 HV）；对接接头的抗拉强度为161 MPa，约为6061铝合金的0.69倍，抗拉强度明显高于搭接接头的。

6061 aluminum alloy and Q235 galvanized steel were butt welded by cold metal transition(CMT) brazing. The microstructure and tensile properties of welded joints were studied. The results show that the welded joint surface was well formed. The welded joint was composed of fusion zone, heat-affected zone and interface layer. The fusion zone consisted of α-Al solid solution and aluminum-silicon eutectic structure. The microstructure of heat-affected zone was coarser than that of the parent metal. Intermetallic compound (IMCs) was formed in the interface layer, the layer thickness was about 8 μm, and the layer grew unidirectionally to the melting zone. The hardness of the heat-affected zone on the side of 6061 aluminum alloy base metal was the lowest (42 HV), and the hardness of the IMCs layer was the highest (365 HV). The tensile strength of the welded joint was 161 MPa, which was about 0.69 times as that of 6061 aluminum alloy, and was improved obviously compared with lap joints.