Microstructure and Percentage Elongation Analysis for Friction Stir Welding of Joining A6061 and A6082 Alloys

The Friction Stir Welding (FSW) is a modern solid phase joining technique of aluminium alloys for producing high quality joints. In this paper, the effect of process parameters of friction stir welded joint of A6061 and A6082 Alloys on microstructures and percentage elongations have been investigated. Joints are fabricated according to L₉ orthogonal array of Taguchi approach. ANOVA is implemented for analyzing the responses with respect to input process parameters (tool rotational speed, tool tilt angle and types of tool pin profile) as the raw data and S/N ratio analysis. The observation revealed minimum variation of microstructure in base metals and dissimilar welded region. The result indicates that the most significant process parameter is rotational speed of tool with percentage contribution of 78.87 % followed by tool pin profile with 15.12 % and tool tilt angle with 5.90 %. The optimum combination of process parameters was found by conducting confirmation test. The predicted and experimental values of percentage elongation of joints are 6.347 % and 6.286 % respectively.