EBSD Results of Material Flow and Microstructural Changes Around Tool Pin for the Dissimilar Friction Stir Welded AA6082-T6 and AA7075-T651

Abstract

Frictional stir welding (FSW) generally experiences the forces Mode I axial metal flow and Mode II shear deformation around the rotating pin, along the welding direction to produce high-efficiency joints. The dissimilar FSW of AA6082/7075 joint was fabricated utilizing the process parameters such as rotational speed (R) of 900 rpm, travel speed (S) 90 mm/min, tilt angle (T) 2° and plunge depth (t) 0.9 mm. Subsequently, the zone-wise EBSD and metal flow analyses were carried out and compared with the results of the microstructure and the microhardness. Distinct variations of Mode I and Mode II metal flow and fine grain formation in weld nugget have been shown here.