对5083-H321铝合金板进行了搭接形式的搅拌摩擦焊，研究了焊接速度对接头拉剪强度和硬度的影响。结果表明：搅拌头转速为180r·min^-1，焊接速度为60mm·min^-1时，可使焊接接头拉剪强度达到200MPa以上，第二道焊缝的热输入使第一道焊缝焊核区晶粒长大，从而使其拉剪强度和硬度降低。
5083-H321 aluminum alloy was welded by friction stir welding in the way of lap, and then the influence of the welding speed of on the tensile-shear strength and hardness of welded joint was studied. The results show that the tensile-shear strength of the welded joint could achieve above 200 MPa when the rotating speed of stirrer was 1 800 r · min and welding speed was 60 mm · min^-1 , the grains in weld seam of frist welding grew up due to the heat input of the second welding, which decreased tensile-shear strength and hardness.
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