Geometry effects when controlling residual stresses in friction stir welds by mechanical tensioning

D. G. Richards, Philip Prangnell, P. J. Withers, S. W. Williams, A. Wescott, E. C. Oliver

    Research output: Chapter in Book/Report/Conference proceedingChapter


    Finite element modelling has proved to be an effective tool for the investigation of trends effected by changing welding conditions. This is especially important in mechanical tensioning of friction stir welds because of the large number of parameters involved. In this paper, an FE model is used to examine the effectiveness of the mechanical tensioning technique for controlling residual stresses in FSWs by the investigation of trends caused by changes to the welding parameters. Comparisons between different geometries, traverse speeds, and welding off-axis angle all produced consistent results, and showed that the peak stresses are most strongly influenced by both the local tensioning and heat input, and not by the more global welding conditions. The results also showed a progressive decrease in the residual stresses for increasing tensioning levels and, although affected by the heat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ∼50% of the room temperature yield stress, tensile stresses were replaced by compressive residual stresses within the weld.
    Original languageEnglish
    Title of host publicationMaterials Science Forum|Mater Sci Forum
    Number of pages5
    Publication statusPublished - 2006
    Event7th European Conference on Residual Stresses, ECRS 7 - Berlin
    Duration: 1 Jul 2006 → …
    http://<Go to ISI>://000241187200021

    Publication series

    NameMaterials Science Forum


    Other7th European Conference on Residual Stresses, ECRS 7
    Period1/07/06 → …
    Internet address


    • AA2024
    • FE modelling
    • Friction stir welding
    • Neutron diffraction
    • Residual stress


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