Refill friction stir spot welding of surface-treated aerospace aluminium alloys with faying-surface sealant
- Boldsaikhan E. ,
- Fukada S. ,
- Fujimoto M. ,
- et al
- Boldsaikhan E. ,
- Fukada S. ,
- Fujimoto M. ,
- Kamimuki K. and
- Okada H.
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An investigation was undertaken to explore the feasibility of welding baseline aerospace aluminium alloys along with additional constituents, such as coatings and a faying surface sealant, by the refill friction stir spot welding (RFSSW) technique and a squeeze out routine to remove uncured sealant from the process zone. The material system studied comprised a top sheet (thickness 1.27 mm) of AA 7075-T6 aluminium alloy, a bottom sheet (thickness 1.6 mm) of AA 2024-T3, an "Alodine" 1200S aero chromate coating and a PR-2870 Class B2 epoxy-based non-chromate sealant. A welding tool with a shoulder diameter of 7 mm and a probe diameter of 4 mm was used for producing coupons. A design of experiments method was employed to optimise RFSSW process parameters. Welded coupons were characterised by static lap-shear pull tests. Response surfaces and Box-Whisker plots for the ultimate shear load are discussed.
12th International Symposium, 26-28 Jun 2018, Session 6B: FSSW I, Paper 02
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