Effect of tool pin profile on mechanical properties of aluminium AA6351 alloy using friction stir welding

Mechanical Engineering

Friction stir welding (FSW) is a novel solid-state joining technique. FSW is gaining more popularity and more extensive application in the manufacturing sector. The heat generation, proper mixing of joint line material and properties of welds depends on the profiles of friction stir tools. This process was, in first time, develop to join the similar aluminum plates but now the technology can be used to weld a large area of materials similar or dissimilar. The present work investigates the effect of tool rotational speed on tensile strength of friction stir welded AA6351 material .Two different tool pin profiles, such as Square and Threaded Tri flute, with four different tool rotational speeds (750,1000,1250 and 1500 rpm) have been used to weld the joints. The effect of the pin profiles and the tool rotational speed on the tensile properties are analyzed. The joint exhibited maximum tensile strength at tool rotational speed of 1250 rpm. Tri flute tool provide the better tensile strength when compare to straight square tool at all tool rotational speeds.

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