EFFECT OF TOOL TILT ANGLE ON TENSILE STRENGTH OF FRICTION STIR WELDED DISSIMILAR ALUMINIUM ALLOY USING OPTIMIZATION TECHNIQUE

Mechanical Engineering

Friction stir welding (FSW) as a solid state joining technology, is one of the environmental friendly fabrication techniques involving energy efficiency and versatility to provide satisfactory combination of microstructure and mechanical properties of the assemblies. In this work dissimilar aluminium (AA6061 & AA7075) plates were welded using Friction stir welding. In this work a Universal testing machine was used to carry tensile test of welded pieces. The optimization of different parameters is done by using Taguchi Approach. In this experiment L9 orthogonal array is used with three controllable factors like Rotational Speed, Welding Speed and Tool tilt angle with three levels of each to find out optimum level of parameters for maximization of tensile strength. The ANOVA results used to find out significant factor and percentage contribution of individual factor. Optimum level of rotational speed (1200 rpm), welding speed (40mm/rev) and Tool tilt angle (2̊) shows highest tensile strength of (130.12 Mpa). In this investigation Tool tilt angle plays a vital role and contributes 50.71% to the overall contribution.

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