In this work, lap-joined titanium alloy sheets have been successfully spot welded using friction stir spot welding (FSSW). Fully consolidated spot welds of thin Ti6Al4V sheets were obtained with a convex scrolled polycrystalline cubic boron nitride probe. The influence of processing parameters on FSSW was evaluated through a finite element analysis (FEA). Numerical results showed that von Mises stress and strain distributions were non-symmetric in the stir zone, whereas higher temperatures were observed in the region next to the tool pin. The welding microstructures showed different effects due to temperature gradients and material flow. The tool configuration played a significant role when determining the spot weld quality, since it directly influences the flow behavior of FSSW. It was observed that, in the stir zone, the microstructure suffered a transformation from α to β. The effect of welding parameters and the development of a FEA for the friction stir spot process were explored in the current investigation.

在这项工作中，搭接连接的钛合金薄板已经成功地通过摩擦搅拌点焊（FSSW）进行了点焊。用凸涡旋多晶立方氮化硼探针可获得Ti6Al4V薄板的完全固结点焊。通过有限元分析（FEA）评估了加工参数对FSSW的影响。数值结果表明，冯·米塞斯应力和应变分布在搅拌区中是不对称的，而在靠近工具销的区域中观察到较高的温度。焊接微结构由于温度梯度和材料流动而显示出不同的影响。工具配置在确定点焊质量时起着重要作用，因为它直接影响FSSW的流动行为。据观察，在搅拌区，显微组织经历了从α到β的转变。在当前的研究中，探索了焊接参数的影响以及搅拌摩擦点焊工艺的有限元分析的发展。