Multi-Response Optimization of FSW Parameters for Dissimilar Al-Mg Alloys

Abstract

In this research, friction stir welding of dissimilar Aluminium alloy-AA6061 and magnesium alloy-AZ31B is performed by varying the process parameter such as Rotational speed, welding speed and tool tilt angle. The main objective of the research is to optimize the FSW process parameter for achieving high tensile strength and hardness of welded joints. The experiment is designed according to RSM-face centered central composite design techniques by varying process parameters. The regression equation is developed based on the result of the FSW experiment. ANOVA is used to validate the developed regression model and to identify the influences of process parameters on tensile strength and hardness of welded joints. The desirability approach is a statistical method for solving multiple response optimization. The optimum process parameters for high tensile strength and hardness are SR = 1000 rpm, SW = 20 mm/min, TA = 2 deg. The confirmatory test is performed for optimal setting and results are also acceptable with prediction.

Keywords

• aluminium alloy-AA6061
• dissimilar friction stir welding
• magnesium alloy AZ31B
• RSM
• tensile strength
• Vicker's hardness