Assessment of hydrogen cracking risk in multipass weld metal of 2.25Cr-1Mo-0.25V-TiB(T24) boiler steel

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    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 To/Ti 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)45-58
    Number of pages14
    JournalWelding in the World
    Volume49
    Issue number7-8
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed

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

    Keywords

    • ProperTune

    Cite this

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    title = "Assessment of hydrogen cracking risk in multipass weld metal of 2.25Cr-1Mo-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 To/Ti 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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    author = "Pekka Nevasmaa and Anssi Laukkanen",
    year = "2005",
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    pages = "45--58",
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    Assessment of hydrogen cracking risk in multipass weld metal of 2.25Cr-1Mo-0.25V-TiB(T24) boiler steel. / Nevasmaa, Pekka; Laukkanen, Anssi.

    In: Welding in the World, Vol. 49, No. 7-8, 2005, p. 45-58.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

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    AU - Nevasmaa, Pekka

    AU - Laukkanen, Anssi

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    Y1 - 2005

    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 To/Ti 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 To/Ti 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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