Refill friction stir spot welding of aerospace alloys in the presence of interfacial sealant

Pedro Miguel de Sousa Santos, Anthony R. McAndrew, João Gandra, Xiang Zhang

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    Abstract

    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.

    Original languageEnglish
    Article numberWITW-D-20-00337
    Pages (from-to)1451-1471
    Number of pages21
    JournalWelding in the World
    Volume65
    Issue number8
    Early online date29 Mar 2021
    DOIs
    Publication statusPublished - Aug 2021

    Bibliographical note

    The final publication is available at Springer via http://dx.doi.org/10.1007/s40194-021-01113-3

    Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

    Keywords

    • Refill friction stir spot welding
    • High strength aluminium alloys
    • Process parameter optimisation
    • interfacial sealant
    • Fatigue testing

    ASJC Scopus subject areas

    • Engineering(all)

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