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Influence of Tool Pin Profile on Microstructure and Mechanical Properties of Friction Stir Welded 6351 Aluminium Alloy

N Srujana, O Umadevi and G Venkateswarlu

The objective of this investigation is to study the effect of five tool pin profiles, namely straight, cylindrical, taper cylindrical, threaded cylindrical, square and triangular on the mechanical properties and microstructure of friction stir welded aluminium AA6351 alloy. The defect free FSW butt joints were produced on the alloy sheet at a constant rotational speed 900 rpm and traverse speed of 65mm/ min with different tool profiles. The results indicate that the triangular tool produced mechanically sound and metallurgically free, defect weld joints compared to other tool pin profiles