Operations of restoration are widely made on rail presenting damaged running band. Several layers of weld metal are deposited by arc-welding technique. Unfortunately, this kind of restoration can have limited lifetime, particularly on high speed lines, due to cracks initiation in welding layers. One of the main reasons of cracks development on welds is the presence of small gas inclusions spread among the whole repair, which could then cause crack initiation under mechanical stress. SNCF asked CEA to develop a non-destructive method and an associated instrumentation to detect gas inclusions in restorations; this method is based on UT-phased array technique. An analysis method was also developed to characterize inclusions in terms of quantity, position and size. The developed method of inspection has then been carried out by SNCF on high speed lines, and a total of around 370 restorations were inspected. Statistical analysis realized on these acquisitions will aim at assessing the general health of restorations, and enhancing the understanding of the crack initiation mechanism.


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    Title :

    Rail restoration lifetime on high speed line


    Additional title:

    Lebensdauer Instand gesetzter Hochgeschwindigkeitsbahnschienen


    Contributors:
    Bredif, P. (author) / Plu, J. (author) / Royer, C. (author) / Poidevin, C. (author) / Pouligny, P. (author)


    Publication date :

    2010


    Size :

    10 Seiten, 15 Bilder, 1 Tabelle, 3 Quellen


    Remarks:

    (nicht paginiert)


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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