Parametric Optimization of Friction Stir Lap Welding of AA5083-AA6082 Using Multi Criteria Decision Making Method

Friction Stir weld joint exhibits better quality and properties compared to other fusion welding techniques. Dissimilar lap joining process is considered as a challenge when compared to welding of similar materials due to variations in the chemical composition and mechanical properties of the joining materials. In this project AA 6082-T6 and AA 5083-H111 are joined in lap joint configuration using H13 tool steel with taper threaded pin profile by FSLW as per Taguchi design. Process parameters considered are Tool Rotational Speed, Welding Speed and Tool Tilt Angle. FSLW is conducted on Knee Type Vertical Milling machine FN2V. Mechanical properties like Shear Strength, Peak Load and Elongation are measured by shear tensile test. Hardness at the weld zone is also determined by Vickers Hardness test. Multiple responses are optimized by using TOPSIS method and best Process Parameters are evaluated.