铝合金回填式搅拌摩擦点焊研究现状

Research Status on Refill Friction Stir Spot Welding of Aluminum Alloy

回填式搅拌摩擦点焊作为一种先进的固相焊接技术,能够有效避免液相焊接的固有缺陷,同时消除搅拌摩擦点焊带来的匙孔,因此,在铝合金、镁合金等轻质金属点连接领域有着无可替代的优势,受到了国内外学者的广泛关注。经过多年的发展,回填式搅拌摩擦点焊已经不再局限于早期的套筒下扎模式,而是出现了多种不同的类型和模式,如额外填充式搅拌摩擦点焊、两阶段回填式搅拌摩擦点焊等。本文综述了近年来回填式搅拌摩擦点焊在铝合金焊接领域的研究现状,涉及点焊过程的基本工作原理,焊接工艺及接头组织性能研究,以及焊接接头的常见失效行为分析。本文对工程中回填式搅拌摩擦点焊接头性能的优化、工艺参数的合理选择提供一定的借鉴作用。

As an advanced solid-phase welding technology,refill friction stir spot welding(RFSSW)can effectively avoid the inherent defects of liquid-phase welding,and eliminate the keyhole brought by friction stir spot welding.Therefore,it has irreplaceable advantages in the spot connection field of aluminum alloy,magnesium alloy and other light metals,and has attracted extensive attention.After years of development,RFSSW is no longer limited to the early sleeve insertion mode,but many different types and modes have emerged,such as extra filler RFSSW,two-stage RFSSW,etc.The current research status of RFSSW in the field of aluminum alloy welding in recent years was reviewed,involving the basic working principle,the welding process,the microstructure of the joint and the analysis of failure behavior of the joints.It can provide some reference for the process optimization or parameters selection in RFSSW.