Refill friction stir spot welding (refill FSSW) is one of the most industrially promising friction stir spot welding variants. The absence of an exit hole improves the effectiveness of surface treatments and minimizes damage by fouling. Aerospace aluminium alloys AA2024-T3 and AA7075-T6 with a thickness of 2 mm were used in this investigation. A range of values for rotation speed and plunge depth were experimented to determine the most promising process parameter combination based on the cross-sectional analysis and lap shear strength. The effect of an interfacial sealant on the weld properties was determined for both alloys using the most promising process parameter combination. Fatigue life analysis and fractography using scanning electron microscopy were performed for specimens with and without sealant.
Bibliographical noteThe final publication is available at Springer via http://dx.doi.org/10.1007/s40194-021-01113-3
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- Refill friction stir spot welding
- High strength aluminium alloys
- Process parameter optimisation
- interfacial sealant
- Fatigue testing
ASJC Scopus subject areas