This work presents the results of multiple weld repairs in the same area in seamless API X-52 microalloyed steel pipe. Four conditions of shielded metal arc welding repairs and one as-welded specimen of the girth weld were characterized to determine changes in the microstructure, grain size in the heat affected zone, and to evaluate their effect on the mechanical properties of the weld joints. The mechanical properties by means of tension tests, Charpy-V impact resistance and Vickers hardness of the welds were analyzed. The results indicate that significant changes are not generated in the microstructural constituents of the heat affected zone. Grain growth in the heat affected zone at the specimen mid-thickness with the number of repairs was observed. Tensile strength of the weld joints meets the requirement of the API 1104 standard even after the fourth weld repair. Significant reduction in Charpy-V impact resistance with the number of weld repairs was found when the notch location was in the intersection of the fusion line with the specimen mid-thickness. A significant increase in the Vickers hardness of the heat affected zone occurred after the first repair and a gradual decrease in the Vickers hardness occurred as the number of repairs increases.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Effect of multiple repairs in girth welds of pipelines on the mechanical properties


    Beteiligte:
    Vega, O.E. (Autor:in) / Hallen, J.M. (Autor:in) / Villagomez, A. (Autor:in) / Contreras, A. (Autor:in)

    Erschienen in:

    Materials Characterization ; 59 , 10 ; 1498-1507


    Erscheinungsdatum :

    2008


    Format / Umfang :

    10 Seiten, 25 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Integrity of the girth welds of hydro-carbon transporting pipelines

    Lukacs, J. / Demeter, A. / Harmati, I. | Tema Archiv | 2000


    Cross-weld tensile properties of girth welds for strain-based designed pipelines

    Bowker, J.T. / Gianetto, J.A. / Shen, G. et al. | Tema Archiv | 2007


    Girth welds in modern pipelines: quality control and safety aspects

    Denys, R. | British Library Conference Proceedings | 1994


    The criticality of ECA on girth welds of offshore pipelines

    Bruschi, Roberto / Torselletti, Enrico / Marchesani, Furio et al. | Tema Archiv | 2007