Abstract

In this exploration study, friction stir welding of Al-Li 8090 alloys has been accomplished for the optimization of process parameters for determined joint strength. Taguchi's L9orthogonal array (OA) has been used for different three parameters-tool rotational speed, tool traverse speed, and dwell time. To optimize, multi-response had been carried out through Taguchi’s-based design of expert. It has been designed for all three responses–ultimate tensile strength, and micro hardness, microstructure. Thermal behaviour analysis shows the temperature variation during friction stir welding at different parameters. Analysis of variance has been used as a tool for obtaining DOE-OA to determine the significant process parameter. Tool traverse speed and dwell time has been predicted the two utmost significant parameters which influence extreme quality features of joint by friction stir welding. Validation of the probable value obtains by confirmation experiments at optimal sets shows the worthy agreement with the values of the experimental outcomes.

Key words: Friction stir welding; DOE orthogonal array; analysis of variance; thermal behavior analysis; SEM, micro-hardness; ultimate tensile strength.