铝合金分步回填无匙孔搅拌摩擦点焊工艺

Research on friction stir spot welding with refilling by friction forming process of aluminum alloy with keyholefree

摘要: 针对常规搅拌摩擦点焊在焊接过程结束后会留下匙孔的问题，采用了分步回填无匙孔搅拌摩擦点焊的方法对1060铝合金进行搭接焊接试验，以避免产生匙孔，并对在该方法下采用不同转速得到的焊接接头的微观组织及力学性能进行分析。结果表明：在合适的搅拌头转速下，采用分步回填的方法得到的焊接接头表面美观，无毛刺飞边等缺陷，抗剪切能力较强。

Abstract: 1060 aluminium alloy was friction stir spot welded with refilling by friction forming process to avoid the keyhole which was left at the end of welding by the conventional Friction Stir Spot Welding. The influence of rotating velocity on the microstructures and mechanical properties of the joint were studied. The results show that at the appropriate rotating velocity,the welded joint obtained by refilling has good appearance and no flying burr,which has higher shear capacity.