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Friction Stir Welding of 5754 Aluminum Alloy with Cover Sheet

机译:5754铝合金带盖板的搅拌摩擦焊

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摘要

Friction stir welding can realize high-strength aluminum alloy joints. In this study, friction stir welding with cover sheet (CFSW) is proposed to solve the thinning caused by the tool shoulder and reduce the heat-affected zone. The microstructures and mechanical properties of CFWS were also studied. After the cover sheet was added, a reinforcement was formed on the weld surface, which compensated the thinning caused by the friction of the tool shoulder. As the cover absorbed heat from the shoulder, the width of the heat-affected zone of the welded sheet became smaller than the diameter of the shoulder. Without milling the cover sheet, the tensile strength of the 5754 aluminum alloy joint reached 94% of that of the base metal. The fracture position was the heat-affected zone of the forward-side weld joint. After the cover sheet was added, the stress concentration shifted from the thinning area of traditional friction stir welding to the outside of the welding seam.
机译:搅拌摩擦焊接可以实现高强度铝合金接头。在这项研究中,提出了带盖摩擦搅拌焊(CFSW),以解决由刀肩引起的变薄并减少热影响区。还研究了CFWS的微观结构和力学性能。添加盖板后,在焊缝表面形成加强筋,以补偿由于工具肩部摩擦而引起的变薄。当覆盖物从肩部吸收热量时,焊接板的热影响区的宽度变得小于肩部的直径。在不研磨盖板的情况下,5754铝合金接头的拉伸强度达到了母材的94%。断裂位置是前侧焊接接头的热影响区。添加盖板后,应力集中从传统的搅拌摩擦焊的变薄区域转移到焊缝的外部。

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