Heat Source Models in Simulation of Heat Flow in Friction Stir Welding

Henrik Nikolaj Blich Schmidt, Jesper Hattel

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The objective of the present paper is to investigate the effect of including the tool probe and the material flow in the numerical modelling of heat flow in Friction Stir Welding (FSW). The contact condition at the interface between the tool and workpiece controls the heat transfer mechanisms. The convective heat transfer due to the material flow affects the temperature fields. Models presented previously in literature allow the heat to flow through the probe volume, and the majority of them neglect the influence of the contact condition as the sliding condition is assumed. In the present work, a number of cases are established. Each case represents a combination of a contact condition, i.e. sliding and sticking, and a stage of refinement regarding the heat source distribution. In the most detailed models the heat flow is forced around the probe volume by prescribing a velocity field in shear layers at the tool/workpiece interface. This results in a non-symmetrical temperature field that depends on not only the total heat generation, tool/workpiece geometry and thermal properties, but also on the contact condition, the rotational speed of the tool and the assumed shear layer thicknesses. The models are configured in terms of the the heat source as i) shoulder contribution only, ii) shoulder and probe contribution, the latter as a volume heat source distributed in the probe volume and iii) shoulder and probe contribution distributed at the contact interface, i.e. as a surface flux in the case of sliding and as a volume flux in the shear layers in the case of sticking.
    Original languageEnglish
    Title of host publicationProceedings of The Fourteenth International Offshore and Polar Engineering Conference : ISOPE 2004
    EditorsJin Chung, Raghavan Ayer
    Volume4
    PublisherISOPE
    Publication date2004
    Pages41-49
    Publication statusPublished - 2004
    Event14th International Offshore and Polar Engineering Conference - Toulon, France
    Duration: 23 May 200428 May 2004

    Conference

    Conference14th International Offshore and Polar Engineering Conference
    CountryFrance
    CityToulon
    Period23/05/200428/05/2004
    SeriesProceedings of the International Offshore and Polar Engineering Conference
    ISSN1098-6189

    Keywords

    • friction stir welding
    • tool probe
    • contact condition
    • material flow
    • heat generation

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