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Abstract
Abstract The friction stir welding (FSW) butt joint of 2mm 6061-T6 aluminum alloy was tested. The effects of welding speed and lower shoulder pressure on the microstructure and mechanical properties of the joint were analyzed, and the possible problems in the welding process of thin plate were analyzed in depth. The results show that the yield strength of the welded joint of 6061-T6 aluminum alloy increases with the increase of welding speed, and the mechanical properties of the joint are not sensitive to the change of the pressure under the shoulder. The core area of the welded joint is the weakest area due to the softening of the welded joint and the insufficient amount of plastic metal transfer.
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