采用适当的焊接工艺,实现了汽车用AZ31镁合金与6061铝合金异质金属间的对接搅拌摩擦焊,并进行了显微组织、物相组成和力学性能的测试与分析。结果表明,该异质搅拌摩擦焊接头具有较佳的力学性能,接头的室温抗拉强度为243 MPa,是AZ31母材的93.8%、6061母材的78.4%;接头的室温伸长率为8.5%,是AZ31母材的89.5%、6061母材的70.8%。 By proper welding process, butt friction stir welding between AZ31 magnesium alloy and 6061 aluminum alloy heterogeneous metal for automobile was realized, and the microstructure, phase composition and mechanical properties were tested and analyzed. The results show that the heterogeneous friction stir welded joint has better mechanical properties. The joint tensile strength at room temperature is 243 MPa, which is 93.8% of AZ31 base material and 78.4% of 6061 base metal. The room temperature elongation of joint is 8.5 %, Which is 89.5% of AZ31 base metal and 70.8% of 6061 base metal.