Main Article Content
Friction stir welding is an emerging solid-state joining process which is used to join metals and alloys having low weld ability. The process has provided an improved way of satisfactorily joining aluminium alloys, especially the precipitation hardens able aluminium alloys like AA 7XXX series. The fusion welding of AA 7XXX series alloy is generally not preferred due to its highly sensitive to weld solidification cracking. Friction Stir Welding parameters such as tool pin profile, rotational speed, welding speed, and axial force control the mechanical properties of the FS welded joints significantly. These works focused on the consequence of tool pin profile on the weldment tensile strength of the joints were calculated. In this work, different tool pin profiles are fabricated to weld the aluminium alloy and the effects of tool pin profile on mechanical properties of the aluminium weldments are studied. The stirred zones of aluminium alloys joined with Straight Square (SS), Straight Pentagon (SP), Tapered Square (TS), Tapered Pentagon (TP) and Threaded Cylinder (TC). The effect of tool pin profiles on mechanical properties are investigated and it is found that joints welded with straight square pin profile have improved the mechanical properties of the weldments compared to the other tool pin profiles.