Assessment of the Advantages of Static Shoulder FSW for Joining Aluminium Aerospace Alloys

Hao Wu, Ying Chun Chen, David Strong, Philip Prangnell

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    Stationary (or Static) Shoulder Friction Stir Welding (SS-FSW) is a variant of FSW that was developed primarily to improve the weldability of titanium alloys by reducing the through thickness temperature gradient. Surprisingly, SS-FSW has been largely ignored by the Al welding community because it is widely supposed a rotating shoulder is an essential aspect of the process and that the higher conductivity means the surface heating effect of the shoulder is generally beneficial. In the work presented it is shown that SS-FSW has major advantages when welding high strength aluminium alloys; including a reduction in the heat input, a massive improvement in surface quality, and a narrower and more symmetric temperature distribution, which leads to narrower welds with a reduced heat affected zone width and lower distortion. The reasons for these benefits are discussed based on a systematic study aimed at directly comparing both processes.
    Original languageEnglish
    Pages (from-to)1770-1775
    Number of pages5
    JournalMaterials Science Forum
    Publication statusPublished - 1 Jun 2014


    • Friction Stir Welding (FSW)
    • Stationary Shoulder
    • Thermal Modelling


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