ABSTRACT

The novelty of the present work is the investigation of friction stir spot welding between AA2024 and AA7075 aluminum plates performed by Box-Behnken technique of response surface methodology. The chemical composition of the aluminum alloys is confirmed using XRD analysis. The process parameters of the FSSW process are analyzed to find the significant parameter that influences the output responses; it was revealed that the Tool Rotation Speed (TRS) was the influencing parameter. Furthermore, the most influenced tensile and hardness analysis of FSS Welded joint are identified by empirical analysis and it was found that the Tensile Shear force (Ts) was the improved property due to optimized FSSW process. Desirability approach was used to predict the optimal Ts value. The optimized process parameters are 2168.813 rpm of TRS, 3.32 mm depth of plunge and 46.98s dwell time. The computed Ts values for the present work investigation were 4.0116 kN and it was found that these values are consistent within the results obtained by the validation experiments. The microstructure of the weld joint was analyzed by optical microscope. The correlations between the predicted and experimental results were established.

摘要

本工作的新颖之处在于通过响应面法的 Box-Behnken 技术研究 AA2024 和 AA7075 铝板之间的搅拌摩擦点焊。使用 XRD 分析确认铝合金的化学成分。分析FSSW过程的过程参数，找出影响输出响应的重要参数；结果表明，工具转速（TRS）是影响参数。此外，通过经验分析确定了对 FSS 焊接接头影响最大的拉伸和硬度分析，发现由于优化的 FSSW 工艺，拉伸剪切力 (Ts) 是改进的性能。可取性方法用于预测最佳 Ts 值。优化的工艺参数为 2168.813 rpm TRS，3。32 毫米的切入深度和 46.98 秒的停留时间。目前工作调查计算的 Ts 值为 4.0116 kN，并且发现这些值与验证实验获得的结果一致。采用光学显微镜分析焊接接头的显微组织。建立了预测结果和实验结果之间的相关性。