Assessment of hydrogen cracking risk in multipass weld metal of 2.25CMMo-0.25V-TiB (T24) boiler steel

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Welding modern high-strength steel with low carbon and impurity contents, preheating may be dictated by cracking sensitivity of the weld metal instead of the HAZ. Standardised methods are mostly developed for HAZ cracking cases; the applied experiments are therefore usually single-pass cracking tests. For multiple-pass welding, and provided cracking sensitivity of weld metal dominates the required preheat, standard EN 1011 does not provide the user with any unified, scientifically validated methodology for the calculation of safe preheat. For welds having chemical compositions different from structural steels, such as low-alloy creep resisting steels, the suitability of a given standard procedure, or calculation method, for multipass welds has to be investigated on case by case basis. A study concerned with the assessment of required T0/T1 for 7CrMovTiB10-10 type weld metal in 2.25%Cr-1 %Mo-0.25 %V boiler steel is presented, using EN 1011-2 Method, the Crack - No Crack Diagram Method developed by VTT, and deep-notch Implant test based analytical method developed by Osaka University and VTT. Necessary precautions for safe welding are given. Recent advances in numerical evaluation of hydrogen diffusion in multipass welding using transient finite element analysis are utilised for a thin to thick plate case and the implications discussed.

    Original languageEnglish
    Pages (from-to)29-42
    Number of pages14
    JournalWelding Research Council, Progress Reports
    Volume60
    Issue number7-8
    Publication statusPublished - 1 Jul 2005
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Steel
    Boilers
    Hydrogen
    Welds
    Metals
    Welding
    Cracks
    Preheating
    Heat affected zone
    High strength steel
    Creep
    Carbon
    Impurities
    Finite element method
    Chemical analysis
    Experiments

    Keywords

    • Computation
    • Cracking
    • Creep resisting materials
    • Defects
    • Finite element analysis
    • Influencing factors
    • Low alloy steels
    • Multirun welding
    • Practical investigations
    • Reference lists
    • Steels
    • Weld metal
    • Welded joints

    Cite this

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    title = "Assessment of hydrogen cracking risk in multipass weld metal of 2.25CMMo-0.25V-TiB (T24) boiler steel",
    abstract = "Welding modern high-strength steel with low carbon and impurity contents, preheating may be dictated by cracking sensitivity of the weld metal instead of the HAZ. Standardised methods are mostly developed for HAZ cracking cases; the applied experiments are therefore usually single-pass cracking tests. For multiple-pass welding, and provided cracking sensitivity of weld metal dominates the required preheat, standard EN 1011 does not provide the user with any unified, scientifically validated methodology for the calculation of safe preheat. For welds having chemical compositions different from structural steels, such as low-alloy creep resisting steels, the suitability of a given standard procedure, or calculation method, for multipass welds has to be investigated on case by case basis. A study concerned with the assessment of required T0/T1 for 7CrMovTiB10-10 type weld metal in 2.25{\%}Cr-1 {\%}Mo-0.25 {\%}V boiler steel is presented, using EN 1011-2 Method, the Crack - No Crack Diagram Method developed by VTT, and deep-notch Implant test based analytical method developed by Osaka University and VTT. Necessary precautions for safe welding are given. Recent advances in numerical evaluation of hydrogen diffusion in multipass welding using transient finite element analysis are utilised for a thin to thick plate case and the implications discussed.",
    keywords = "Computation, Cracking, Creep resisting materials, Defects, Finite element analysis, Influencing factors, Low alloy steels, Multirun welding, Practical investigations, Reference lists, Steels, Weld metal, Welded joints",
    author = "P. Nevasmaa and A. Laukkanen",
    year = "2005",
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    }

    Assessment of hydrogen cracking risk in multipass weld metal of 2.25CMMo-0.25V-TiB (T24) boiler steel. / Nevasmaa, P.; Laukkanen, A.

    In: Welding Research Council, Progress Reports, Vol. 60, No. 7-8, 01.07.2005, p. 29-42.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Assessment of hydrogen cracking risk in multipass weld metal of 2.25CMMo-0.25V-TiB (T24) boiler steel

    AU - Nevasmaa, P.

    AU - Laukkanen, A.

    PY - 2005/7/1

    Y1 - 2005/7/1

    N2 - Welding modern high-strength steel with low carbon and impurity contents, preheating may be dictated by cracking sensitivity of the weld metal instead of the HAZ. Standardised methods are mostly developed for HAZ cracking cases; the applied experiments are therefore usually single-pass cracking tests. For multiple-pass welding, and provided cracking sensitivity of weld metal dominates the required preheat, standard EN 1011 does not provide the user with any unified, scientifically validated methodology for the calculation of safe preheat. For welds having chemical compositions different from structural steels, such as low-alloy creep resisting steels, the suitability of a given standard procedure, or calculation method, for multipass welds has to be investigated on case by case basis. A study concerned with the assessment of required T0/T1 for 7CrMovTiB10-10 type weld metal in 2.25%Cr-1 %Mo-0.25 %V boiler steel is presented, using EN 1011-2 Method, the Crack - No Crack Diagram Method developed by VTT, and deep-notch Implant test based analytical method developed by Osaka University and VTT. Necessary precautions for safe welding are given. Recent advances in numerical evaluation of hydrogen diffusion in multipass welding using transient finite element analysis are utilised for a thin to thick plate case and the implications discussed.

    AB - Welding modern high-strength steel with low carbon and impurity contents, preheating may be dictated by cracking sensitivity of the weld metal instead of the HAZ. Standardised methods are mostly developed for HAZ cracking cases; the applied experiments are therefore usually single-pass cracking tests. For multiple-pass welding, and provided cracking sensitivity of weld metal dominates the required preheat, standard EN 1011 does not provide the user with any unified, scientifically validated methodology for the calculation of safe preheat. For welds having chemical compositions different from structural steels, such as low-alloy creep resisting steels, the suitability of a given standard procedure, or calculation method, for multipass welds has to be investigated on case by case basis. A study concerned with the assessment of required T0/T1 for 7CrMovTiB10-10 type weld metal in 2.25%Cr-1 %Mo-0.25 %V boiler steel is presented, using EN 1011-2 Method, the Crack - No Crack Diagram Method developed by VTT, and deep-notch Implant test based analytical method developed by Osaka University and VTT. Necessary precautions for safe welding are given. Recent advances in numerical evaluation of hydrogen diffusion in multipass welding using transient finite element analysis are utilised for a thin to thick plate case and the implications discussed.

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    KW - Creep resisting materials

    KW - Defects

    KW - Finite element analysis

    KW - Influencing factors

    KW - Low alloy steels

    KW - Multirun welding

    KW - Practical investigations

    KW - Reference lists

    KW - Steels

    KW - Weld metal

    KW - Welded joints

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