Investigation on Micro structural and Mechanical Properties of Friction Stir Welded AZ91E Mg Alloy

Friction Stir Welding (FSW) is an eco-friendly solid state welding technique employed particularly for joining aluminium and magnesium alloys since they are difficult to join by conventional joining processes. The influence of tool rotational speed on mechanical properties of friction stir welded AZ91E magnesium alloy was investigated. The FSW processes were carried out at different rotational speeds of 900 rpm, 1000 rpm, 1100 rpm and 1200 rpm and at a constant axial load and transverse speed of 3 KN and 90 mm/min respectively. Further, the micro structural analysis and mechanical testing were performed on the welded joints. It inferred that the dynamic recrystallization have taken place in the friction stir welded zone as a result the joints fabricated at 1000 rpm rotational speed had an increase of 110% in Ultimate Tensile Strength compared to the base metal .