STP1042

    Embrittlement of a Copper Containing Weld Metal

    Published: Jan 1989


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    Abstract

    Elevated temperature isothermal exposure of a “weathering” steel weld containing approximately 0.5% copper, in the as-welded condition, embrittled the weld as characterized by an increase in strength and a decrease in toughness and tensile ductility. A similar embrittlement was not encountered for material exposed in the postweld stress relieved condition. The embrittlement was attributed to the precipitation of an iron-copper intermetallic compound. Control of copper content below the solubility limit or the use of a postweld stress relief heat treatment should prevent the occurrence of any significant embrittlement.

    Keywords:

    weld metal, weathering steel, copper content, embrittlement, elevated temperature exposure, tensile strength, notch toughness, postweld heat treatment, precipitation hardening


    Author Information:

    Christoffel, RJ
    Senior engineer, General Electric Company, Schenectady, NY

    Silvia, AJ
    Senior engineer, Northeast Utilities, Meriden, CT


    Paper ID: STP24582S

    Committee/Subcommittee: A01.14

    DOI: 10.1520/STP24582S


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