在不同焊接速度下对11 mm 厚的2A70-T6铝合金进行搅拌摩擦焊，并对焊缝进行显微组织观察和力学特性测试。结果表明：采用旋转速度为300 r/min、焊接速度为220 mm/min进行焊接时，可获得优质的焊缝接头，其焊缝抗拉强度为357.6 MPa；前进侧的熔合过渡区焊缝金属变化剧烈；焊核区呈现细小的等轴状晶粒；返回侧熔合过渡区塑性金属变形的梯度较前进侧缓和。随着焊接速度的增大，焊核区和晶粒尺寸逐渐变小，焊缝的抗拉强度也逐渐增大，但增大幅度逐渐变小。
Friction stir welding of 2A70?T6 aluminum alloy with the thickness of 11 mm was carried out under different welding speed,the microstructure of weld was observed and the joint strength was tested. The results show that high quality joint can be obtained at the rotating speed of 300 r/min and welding speed of 220 mm/min,and the joint strength is 357.6 MPa. The transition zone metal at the advancing side of the weld changes dramatically,and the microstructure in the nugget zone is equiaxed fine grain,the transition zone metal at the retreating side of the weld changes smoothly compared with that at the advancing side. With the welding speed increasing,the weld nugget zone and the grain size gradually decrease,and the joint strength increases,but the increasing amplitude decreases.
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