Investigation of the FSW Process Parameters in the Optimal Quality of Aluminum Alloys AA1050 by the Fuzzy Logic in Taguchi Technique

摘要

Friction Stir Welding (FSW) can produce superior mechanical properties in the weld zone. In this paper, two plates of aluminum alloy AA1050 were FSW in the butt joint. In the FSW procedure, there were four mainly controllable four-level factors, i.e., the tool rotation speed, transverse speed (feed rate), tool tilt angle with respect to the workpiece surface and pin tool length. Analysis of variance (ANOVA) is the statistic method used to interpret these experimental data. Taguchi technique with ANOVA is used to find out the significant variables (factors) for the ultimate tensile strength and elongation rate measuring with the noise performance. Finally, the effects of the ultimate tensile strength and the elongation rate are combined by fuzzy logic to be one performance index so called multiple performance characteristics index (MPCI). The MPCI measurement is regarded as the entirely optimal quality of welded aluminum alloy butt joint.