Abstract

The progress of friction stir welding has offered a different approach for fabricating superior class weld. In this paper deals with multi objective optimization of process control variables influencing weld features in customized friction stir butt welding of 6 mm thick dissimilar plates of AA7075 and AA6101 using Taguchi grey relational approach. The L27 orthogonal array has been employed to design the experimental trails and the joints have been fabricated in a laboratory stage friction stir welding machine by varying tool revolving speed, worktable translational speed, tool plunge force and tool pin shape. After welding, the weld tensile properties and impact strength have been evaluated using universal testing machine. Based on the experimental results optimum levels of process control variables have been noted using grey relation rating and compared with confirmation test.

Keywords : Friction stir welding, mechanical properties, multi objective, dissimilar aluminum alloy, Grey Relation Grade.