Study of Friction Stir Spot Welding of Aluminum/Copper Dissimilar Sheets using Taguchi Approach

Friction stir spot welding of dissimilar aluminum and copper sheets was investigated in details using Taguchi approach in this study. Analysis of variance was conducted to identify the effective parameters and their contributions on the mechanical performance. The findings revealed that the outputs followed normal distribution. The results indicated that the rotational speed with the contribution of ۸۷.۷% was the most effective parameter on the maximum tensile force tolerated by the welded samples. Dwell time and penetration depth were in second and third ranks from effectiveness viewpoint with the contributions of ۸.۸ and ۲.۹%, respectively. The results revealed that the maximum tensile force was significantly improved with the rotational speed. The maximum tensile force was enhanced by almost ۲۲۸% by increasing the rotational speed from ۵۵۰ rpm to ۱۵۰۰ rpm. Increasing the dwell time from ۱۰ to ۲۰ s led to improve the maximum tensile force by ۳۱%.The sequence of the parameters was as rotational speed, dwell time and penetration depth from standpoint of influence on the maximum force according to the results of signal to noise ratio analysis. The signal to noise ratio analysis showed that the rotational speed of ۱۵۰۰ rpm, the penetration depth of ۲.۸۵ mm, and the dwell time of ۲۰ s were the optimum conditions.

کلیدواژه ها:

Friction stir spot welding ، Dissimilar sheets ، tensile properties ، Taguchi approach