Eighteen years ago, the automotive industry started using the friction stir spot welding (FSSW) process in joining of metallic parts. The popularity of this welding process enlarged every year. In this study aluminum 1020 sheets of 2 mm thickness were joined with the FSSW process. The effects of FSSW parameters (plunge depth, tool rotation speed and dwell time) on the mechanical properties of weldments were investigated. The mechanical performance of the welds has been evaluated by the lap-shear tensile test. The optimization was done by the Taguchi method. “The highest -the better” quality control characteristic using the Analysis of Variance (ANOVA) method was applied to determine the optimum welding parameters. Signal to Noise ratio (S/N) was computed to calculate the optimal process parameters. Percentage contributions of each parameter were validated by using analysis of variance (ANOVA) technique. The experimental results were analyzed by using Minitab 16 software. The tool rotation speed was found the dominant welding parameter on weld strength of aluminum 1020 sheets friction stir spot welding process. The weld which was produced with the optimum welding parameters gave a 23% higher fracture load than the initial welds.

中文翻译：

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利用Taguchi实验设计进行铝搅拌摩擦点焊焊接强度的试验研究与优化。

十八年前，汽车工业开始在金属零件的连接中使用搅拌摩擦点焊（FSSW）工艺。这种焊接工艺的普及每年都在增加。在这项研究中，通过FSSW工艺将1020张2mm厚的铝板连接在一起。研究了FSSW参数（切入深度，工具旋转速度和停留时间）对焊件力学性能的影响。焊缝的机械性能已通过搭接剪切拉伸试验进行了评估。优化是通过田口方法完成的。采用方差分析（ANOVA）方法的“最高–更好”的质量控制特性可用于确定最佳焊接参数。计算信噪比（S / N）以计算最佳工艺参数。使用方差分析（ANOVA）技术验证每个参数的百分比贡献。使用Minitab 16软件分析实验结果。发现工具转速是影响铝1020薄板摩擦搅拌点焊工艺焊接强度的主要焊接参数。使用最佳焊接参数生产的焊缝比初始焊缝的断裂载荷高23％。