Predicting Grain Size and Tensile Strength of Friction Stir Welded Joints of AA7075-T₆ Aluminium Alloy

Abstract

This article reports empirical relationships to predict grain size and tensile strength of friction stir welded (FSW) AA7075-T₆ aluminium alloy joints. Six-factor, five-level, central composite rotatable design matrix is used to optimize the experimental conditions. The empirical relationships are developed by response surface methodology (RSM) incorporating tool and process parameters. A linear regression relationship is also established between grain size of weld nugget and tensile strength of FSW joints.

Keywords:

• Aluminium
• Analysis of variance (ANOVA)
• Microstructure
• Welding

Notes

Note. DF = Degrees of freedom; SS = Sum of squres; MS = Mean squres; F = Fishers ratio; P = Probability.