Treffer: Texture evolution in friction stir lap welding of dissimilar AA6061 and AA7075 alloy at different configurations.

The current work aims to explicate the influence of lap configuration on microstructure, texture evolution, and subsequently, the joint performance of dissimilar friction stir lap welding of AA7075 and AA6061, keeping tool rotational and weld traverse speed unaltered. Conf. 1 (AA6061-T6 at top and AA7075-T6 at bottom) joint shows inadequate intermixing of material along with the presence of small voids in the SZ, whereas for Conf. 2 (AA6061-T6 at bottom and AA7075-T6 at top), proper material mixing occurs, characterized by the formation of oval structures and a distinct ring flow pattern. Wide variation in grain size at the stir zone (SZ) in Conf. 1 joint is noted owing to grain refinement and abnormal grain growth near the shoulder region, while Conf. 2 joint exhibits better grain refinement in SZ. Failure in Conf. 1 joint occurs within the heat affected zone (HAZ), while in Conf. 2, failure initiates at the hook region and propagates through HAZ/SZ, exhibiting a higher failure load (16.07 kN) in comparison to Conf. 1 (13.81 kN). [ABSTRACT FROM AUTHOR]

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