铝合金超薄板无倾角微搅拌摩擦焊接头组织性能
Microstructure and properties of micro friction stir welded joint of Al-alloy ultra thin plate with zero tilt angle
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摘要: 以0.5 mm厚LF3薄壁铝合金微搅拌摩擦焊搭接过程为研究对象,采用超小轴肩搅拌工具,研究了其无倾角微搅拌摩擦焊接过程,重点分析了微观组织分布特点和接头力学性能.采用内聚花纹锥形超小轴肩搅拌工具,依靠轴肩及搅拌针花纹的材料内聚效果,降低了焊缝宽度,焊缝宽度仅为3 mm,为微小薄壁壳体的焊接封装问题提供了可行的解决方案.搅拌工具的超高旋转频率运动,将搭接界面进行了充分的搅拌、混合和破碎,优于传统搅拌摩擦焊的Hook搭接界面.微搅拌摩擦焊搭接接头承载能力平均达到母材承载能力的89.6%.Abstract: The micro friction stir welding of overlap joints of ultra thin Al-alloy plate with thickness of 0.5mm were studied. In the micro friction stir welding process, zero tilt angle and the mini-shoulder friction stir tools were adopted. Especially the microstructure distribution and mechanical properties were analyzed in detail. The results show that the cone-shaped minishoulder friction stir tools with figures can reduce the width of weld seam because of the collecting effect of shoulder figures.The width of weld seam is only 3mm. This method provides a feasible solution for the welding and encapsulation of small thinwalled boxes. Due to the movement of welding tool in ultra high rotation speed, the overlap interface is stirred, mixed, broken, and better than the Hook interface of conventional FSW. The ratio of loading capability of the joint to base metal is 89.6%.
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