采用搅拌摩擦焊方法对厚度为6 mm的3A21铝合金板进行对接焊,研究了其接头的拉伸性能、弯曲性能、冲击性能和显微硬度。结果表明,焊接接头抗拉强度134MPa,接头强度系数为86%;接头弯曲性能良好;接头焊核区冲击韧度最好;焊接区显微硬度值较低,发生了软化。 The friction stir welding method was used to butt weld the 3A21 aluminum alloy plate with a thickness of 6 mm. The tensile properties, flexural properties, impact properties and microhardness of the joints were studied. The results show that the tensile strength of the welded joint is 134MPa and the strength coefficient of the joint is 86%. The bending property of the joint is good. The impact toughness of the weld nugget is the best. The hardness of the welded zone is lower and the softening occurs.