Influence of Tool Rotation Speed on Macrostructure, Microstructure and Mechanical behaviour of Dissimilar Friction Stir Welded AA2014-T6 and AA7075-T6 Aluminum Alloys

Material joining technologies lately investigates the prospects of utilizing dissimilar aluminum alloys in automotive and ship building ventures to diminish their manufacturing cost. Friction Stir Welding (FSW) technique is a potential answer for dissimilar metal joining than other customary joining techniques. This paper investigates the influence of tool rotational speed on joining dissimilar AA2014-T6 and AA7075-T6 aluminum alloys using FSW. The joints are made by altering the tool rotational speed within the range and by maintaining welding speed and shoulder diameter to pin diameter ratio at optimized values. An aggregate of five joints were manufactured to bring out the metallographic and mechanical behaviour of the joints. Microstructural assessment of the weld zone affirms the arrangement of recrystallized fine grain dissemination and proper material blending at the stir zone. The ultimate tensile strength and microhardness of the joints were assessed for the joints and presented. The outcomes confirmed that the joint made-up with 1300 rpm rotational speed displays a higher strength and better quality weld.