A previously developed heat transfer model is used to study the influence of welding parameters on weld defect development in thermite welds. Weld defect formation maps are constructed from a series of heat transfer simulations. For the current normal rail thermite welding conditions, it is found that shrinkage cavity formation can be avoided but cold-lap and centre-line defects are likely to occur. This study also shows that increasing the preheating time or the liquid temperature can suppress the development of cold-lap and centre-line defects but can lead to a slightly higher microporosity content in the railhead as well. Alternatively, it is found that instead of increasing the preheating time or the liquid temperature, the same effect can be achieved by increasing the 25 mm weld gap (standard) to a slightly larger value.


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    Titel :

    Weld defect formation in rail thermite welds


    Weitere Titelangaben:

    Schweißfehlerbildung bei Thermitschweissungen von Schienen


    Beteiligte:
    Chen, Y. (Autor:in) / Lawrence, F.V. (Autor:in) / Barkan, C.P.L. (Autor:in) / Dantzig, J.A. (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    12 Seiten, 21 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Weld defect formation in rail thermite welds

    Chen, Y. / Lawrence, F. V. / Barkan, C. P. L. et al. | British Library Online Contents | 2006


    Weld defect formation in rail thermite welds

    Chen, Y / Lawrence, F V / Barkan, C P L et al. | SAGE Publications | 2006


    Weld defect formation in rail thermite welds

    Chen, Y. | Online Contents | 2006


    A model for fatigue defect nucleation in thermite rail welds

    Fry, G.T. / Lawrence, F.V. / Robinson, A.R. | Tema Archiv | 1996