Residual stresses in aluminum alloy AA7475-T761 using X-Ray diffraction technique


Friction stir welding (FSW) is a well-known solid-state welding technology invented in 1991 at The Welding Institute (TWI), in England. As a solid-state process, it is expected low temperature (below the melting point) as well as low distortion after welding. Therefore, low distortion involves low residual stresses, and that is the best condition when designing components subjected to cyclic loads and fatigue. Using X-Ray diffraction technique to analyze residual stress, this study proposes to evaluate the results on a similar butt welded joint of AA7475-T761 aluminum alloy sheet with 1.6 mm thickness. Rotational speed, probe plunge depth, and tool tilt were kept constant whereas tool travel speed was varied. All joining were made in an FSW dedicated machine, model GG-7 manufactured by MTI available at IPT-LEL. The results are consistent with literature data and in terms of the mechanical design of components. Longitudinal residual stresses values are approximately 11% of tensile strength and 13% of yield strength.

PERANDINI, João Paulo Buoro; RESENDE, Hugo Borelli; BATALHA, Mario Henrique Fernandes. Residual stresses in aluminum alloy AA7475-T761 using X-Ray diffraction technique. In: INTERNATIONAL CONGRESS OF MECHNICAL ENGINEERING, 24., 2017, Curitiba. Proceedings… 7p.

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