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The effect of tool rotation speed on microstructure and mechanical properties of self-reacting friction stir welded joints was investigated for Al-Mg-Si alloy. Joints were produced by a newly designed pin tool with rotation speeds ranging from 300 to 600 rpm at a constant welding speed of 350 mm/min. Cavity defect was observed in the weld obtained at the lowest rotation speed, and defect-free joints...
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