Fatigue life of dissimilar AA6061-AA7075 FSW joints
(2022) Joint International Symposium on Friction Stir Welding and Processing — Location: Lüneburg, Germany (28.September.2022)
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- Authors
Sapanathan, Thaneshan 
- Abstract
- Friction Stir Welding (FSW) has successfully been integrated by the automotive, aerospace and space industries for welding aluminum alloys. Previous studies already focused on the welding of AA6061 and AA7075 by FSW regarding microstructures, residual stresses and mechanical properties such as yield strength or ultimate tensile strength of the joints. However, understanding high cycle fatigue (HCF) mechanisms is crucial in an industrial context to fully implement the FSW process [1]. Previous studies regarding fatigue properties in dissimilar joints have studied crack initiation and growth. An substantial weld manufacturing campaign of dissimilar Al 6061-7075 FSW joints was carried out to understand and optimize process parameters. From theses samples, an extensive fatigue analysis was performed. Wöhler curves were obtained and compared to the base materials and the literature. Welds with comparable fatigue properties to the base material were produced. Fractography was performed to identify rupture mechanisms. As such, defects we recognized as responsible for crack initiation such as joint line remnant or local surface melting with coalescence of alloying elements were investigated in order to explain their respective impact on fatigue properties.
- Affiliations
Ecole Plytechnique, Palaiseau Laboratoire de Mécanique des Solides Thales Global Services TGS
Citations
Dimov, N., Sapanathan, T., Benoist, J., Charkaluk, E., & Simar, A. (2022). Fatigue life of dissimilar AA6061-AA7075 FSW joints. Joint International Symposium on Friction Stir Welding and Processing, Lüneburg, Germany. https://hdl.handle.net/2078.5/102519