Friction stir welding between 5052 aluminum alloy plates with a thickness of 2 mm was performed. The tool for welding was rotated at speeds ranging from 500 to 3 000 r/min under a constant traverse speed of 100 mm/min. The results show that at all tool rotation speeds, defect-free welds are successfully obtained. Especially at 1 000, 2 000 and 3 000 r/min, the welds exhibit very smooth surface morphologies. At 500, 1 000, and 2 000 r/min, onion ring structure is clearly observed in the friction-stir-welded zone (SZ). In addition, the onion ring structure region becomes wider as the tool rotation speed is increased. The gain size in the SZ is smaller than that in the base metal, and is decreased with a decrease of the tool rotation speed. In all tool rotation speeds, the SZ exhibits higher average hardness than the base metal. Especially at 500 r/min, the average hardness of the SZ reaches a level about 33% greater than that of the base metal. At 500, 1 000 and 2 000 r/min, the tensile strength of the friction stir welded (FSWed) plates is similar to that of the base metal (about 204 Mpa). The elongation of the FSWed plates is lower than that of the base metal (about 22%). However, it is noticeable that the maximum elongation of about 21% is obtained at 1 000 r/min.
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机译：进行5052铝合金板之间的摩擦搅拌焊接，厚度为2mm。在恒定的横向速度为100mm / min的恒定速度下，焊接工具以500至3 000 r / min的速度旋转。结果表明，在所有刀具旋转速度下，成功获得无缺陷焊缝。特别是在1000,2000和3 000 r / min，焊缝表现出非常光滑的表面形态。在摩擦搅拌焊接区（SZ）中清楚地观察到500,000,000和2 000千分之，洋葱环结构。另外，随着刀具转速增加，洋葱环结构区域变宽。 SZ中的增益尺寸小于基础金属中的增益尺寸，并且随着刀具转速的减小而减小。在所有工具旋转速度中，SZ表现出比基础金属更高的平均硬度。特别是在500 r / min，Sz的平均硬度达到比基础金属大的33％达到约33％。在500,100,000和2 000 r / min时，摩擦搅拌焊接（FSWED）板的拉伸强度类似于基础金属（约204MPa）的拉伸强度。 FSWED板的伸长率低于基础金属（约22％）。然而，明显是，在1 000 r / min获得约21％的最大伸长率。
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