Acoustic analysis in friction stir welding of 6082 - T6 aluminium alloy plates

Abstract

Abstract Acoustic analysis has been performed on the sound recorded during friction stir welding of AA 6082 – T6 aluminium alloy plates. The experiments were performed by taking three process parameters viz., Speed of tool rotation, Traverse speed (Feed), Tool tilt angle. Six experiments were performed by varying the process parameters and sound generated during the welding process is recorded. Frequency – domain analysis was performed on the sound recorded and peak magnitudes were noted. Regression analysis was performed between peak magnitude and Ultimate Tensile Strength (UTS) values of all experimental conditions. From the two graphs plotted between experiment number versus Peak magnitude and experiment number versus UTS it was shown that as the peak magnitude values increase the UTS also increases and it was confirmed from the coefficient of the peak magnitude in the regression equation. The fits as predicted from the regression equation yielded minute residuals and were able to predict the UTS values with good accuracy. A straight line was fitted in the Time – Domain graph obtained from the recorded sound which was half wave rectified and sample points taken for every 5 s. Regression analysis performed on coefficients obtained from straight line equations for all experiments and Feed values show that the Feed values of all experimental conditions can be predicted to high degree of accuracy.