对4 mm厚1060铝分别进行了搅拌摩擦焊(FSW)和钨极氩弧焊(TIG),焊后对FSW和TIG接头的显微组织和力学性能进行了对比研究。结果表明:FSW接头的焊核区发生了动态再结晶,形成了细小的等轴晶粒;热机影响区受搅拌头机械搅拌和焊接热循环的综合作用组织发生了较大程度的变形;热影响区组织发生粗化现象。TIG接头组织表现出明显的铸态组织,且靠近熔池的柱状晶沿母材向对接中心线显著长大。力学试验表明:FSW接头的抗拉强度优于TIG接头的抗拉强度,约为TIG接头的1.5倍。两种接头的断裂形式均为韧性断裂;两种接头的显微硬度最低值均出现在热影响区,且FSW接头的显微硬度优于TIG接头。 Friction stir welding (FSW) and TIG were respectively carried out on 4 mm thick 1060 aluminum. The microstructure and mechanical properties of FSW and TIG joints after welding were compared. The results show that dynamic recrystallization occurs in the nugget zone of FSW joint and fine equiaxed grains are formed. The heat affected zone is deformed to a great degree under the combined effect of mechanical stirring and welding thermal cycle. Regional organizations have roughened. TIG joint showed obvious as-cast microstructure, and the columnar crystals close to the weld pool grew significantly along the base metal toward the centerline of the joint. Mechanical tests show that the tensile strength of FSW joint is better than that of TIG joint, which is about 1.5 times of TIG joint. The fracture modes of the two kinds of joints are all ductile fracture. The lowest microhardness values ​​of the two kinds of joints appear in the heat affected zone, and the microhardness of the FSW joint is better than the TIG joint.