Friction stir welding is a novel solid-state welding process for joining aluminum alloy components. The heat generation, proper mixing of joint line material and properties of welds depends on the profiles of friction stir tools. Aluminum alloy Al 1120 plates were welded via friction stir welding using deferent friction stir tools. The effects of tool pin profile on mechanical properties were reported in this paper. The result reveals that weld joints formed with a taper threaded pin tool exhibited better tensile and flexure strength. However, welds formed with a cylindrical threaded pin tool showed higher hardness and impact strength.

中文翻译：

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刀具轮廓对铝合金Al 1120搅拌摩擦焊力学性能的影响。

搅拌摩擦焊是一种用于连接铝合金部件的新型固态焊接工艺。热量的产生，接缝材料的适当混合以及焊缝的性能取决于搅拌摩擦工具的外形。使用不同的搅拌摩擦工具通过搅拌摩擦焊接来焊接铝合金Al 1120板。本文报道了工具销轮廓对机械性能的影响。结果表明，用锥形螺纹销钉工具形成的焊接接头具有更好的拉伸强度和弯曲强度。但是，用圆柱螺纹销钉工具形成的焊缝显示出更高的硬度和冲击强度。