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The Role of Mechanical Connection during Friction Stir Keyholeless Spot Welding Joints of Dissimilar Materials

机译：机械连接在异种材料搅拌摩擦无孔点焊中的作用

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Contrast experiments of lap joints among dissimilar AZ31B Mg alloy, Mg99.50, zinc-coated DP600 sheet, and non-zinc-coated DP600 sheet were made by friction stir keyholeless spot welding (FSKSW) and vacuum diffusion welding (VDW), respectively. Scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS) were used to investigate the microstructures and components of the joints welded. The experimental results show that the FSKSW bonding method is a kind of compound mode that contains a mechanical connection and element diffusion fusion connection, in which mechanical connection has the main decisive function on joints of Mg/steel. Elements diffusion exists in the interfacial region of the joints and the elements diffusion extent is basically the same to that of VDW. The elements’ diffusion in Mg/steel using FSKSW is defined in the reaction between small amounts elements of the base metal and zinc-coated metals. The intermetallic compounds and composite oxide perform some reinforcement on the mechanical connection strength.
机译：分别通过摩擦搅拌无孔点焊（FSKSW）和真空扩散焊接（VDW）进行了不同AZ31B镁合金，Mg99.50，镀锌DP600板和非镀锌DP600板搭接接头的对比实验。使用扫描电子显微镜（SEM）和能量分散光谱（EDS）来研究焊接接头的显微组织和成分。实验结果表明，FSKSW键合方法是一种包含机械连接和元素扩散熔合连接的复合方式，其中机械连接对Mg /钢的接头起主要决定作用。元素的扩散存在于关节的界面区域，元素的扩散程度基本上与VDW相同。使用FSKSW的元素在Mg /钢中的扩散定义为少量贱金属元素与镀锌金属之间的反应。金属间化合物和复合氧化物对机械连接强度具有一定的增强作用。

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