Towards advanced welding methods for the ITER vacuum vessel sectors

L. Jones, P. Aubert, F. Coste, H. Handroos, Tommi Jokinen, Veli Kujanpää, P. Meja, K. Nightingale, W. Wykes

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

    5 Citations (Scopus)

    Abstract

    The problem of joining the ITER VV sectors, considering the tolerance requirements of the blanket attachments, and the time required for TIG welding, continues to stimulate EU R&D into power beam welding techniques for fewer passes and lower distortion by a factor of up to 5. The work on reduced pressure e-beam welding showed that penetration varied with position, fit-up, distance and pressure and single-pass weld control seemed impractical so work on a combination of rest-current-control root weld followed by wire-fill passes promises a practical solution. The NdYAG laser welding has yielded useful and stable results and demonstrated the possibilities of improved performance over TIG. Design on the welding robot has been simulated by the successful use of computational virtual modeling techniques. A robust, singularity-free, hydraulic, parallel-configuration robot is under construction to demonstrate welding and control scenarios and the possibility of active suppression of vibrations induced by machining forces.
    Original languageEnglish
    Title of host publication22nd Symposium on Fusion Technology
    Subtitle of host publicationBook of Abstracts
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages344-344
    ISBN (Electronic)951-38-5731-X
    ISBN (Print)951-38-5730-1
    Publication statusPublished - 2002
    Event22nd Symposium on Fusion Technology - Helsinki, Finland
    Duration: 9 Sep 200213 Sep 2002
    Conference number: 22

    Publication series

    SeriesVTT Symposium
    Number220
    ISSN0357-9387

    Conference

    Conference22nd Symposium on Fusion Technology
    Abbreviated titleSOFTA
    CountryFinland
    CityHelsinki
    Period9/09/0213/09/02

    Keywords

    • welding

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  • Cite this

    Jones, L., Aubert, P., Coste, F., Handroos, H., Jokinen, T., Kujanpää, V., Meja, P., Nightingale, K., & Wykes, W. (2002). Towards advanced welding methods for the ITER vacuum vessel sectors. In 22nd Symposium on Fusion Technology: Book of Abstracts (pp. 344-344). [JO-15] VTT Technical Research Centre of Finland. VTT Symposium, No. 220 http://www.vtt.fi/inf/pdf/symposiums/2002/S220.pdf