To reduce the cost of long distance gas transmission, high strength pipeline steels are being developed. Implementation of high strength pipeline materials requires the avoidance of hydrogen cracking during field girth welding. A study of hydrogen cracking in X120 girth welds has been conducted. Cracking resistance of both the weld metal and heat affected zone (HAZ) were investigated. The laboratory tests included the controlled thermal severity (CTS) test, the WIC test and the Y-groove test. In addition, multi-pass plate welds and full pipe welds were completed and examined for the presence of hydrogen cracks. The suitability of each test method for predicting cracking in X120 girth welds is determined. The morphology of hydrogen cracks in X120 girth welds is described, and the conditions necessary to prevent hydrogen cracking are identified. Following the laboratory studies, construction of X120 pipelines without cracking was demonstrated through a 1.6 km field trial.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Evaluation of hydrogen cracking susceptibility in X120 girth welds


    Contributors:
    Macia, M.L. (author) / Koo, J.Y. (author) / Fairchild, D.P. (author) / Bangaru, N.V. (author)


    Publication date :

    2004


    Size :

    10 Seiten, 17 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Girth welding development for X120 linepipe

    Fairchild, D.P. / Macia, M.L. / Bangaru, N.V. et al. | Tema Archive | 2004



    Defect tolerance in pipeline girth welds

    Hopkins, P. / Jones, D.G. / Fearnehough, G.D. | Tema Archive | 1984


    Fracture toughness estimation for pipeline girth welds

    Pisarski, H.G. / Wignall, C.M. | Tema Archive | 2002


    Root Pass Stresses in pipeline girth welds

    Higdon, Harold Irwin | TIBKAT | 1978