STP962

    Diffusible Hydrogen Testing by Gas Chromatography

    Published: Jan 1988


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    Abstract

    In recent years, there has been a rising interest in diffusible hydrogen testing of steel weld metals. Several test methods have been used with varying degrees of success. The glycerin displacement method, which has been widely used, has been demonstrated to be inaccurate and under certain conditions totally unreliable. Alternative use of mercury as a collection medium provides for reliability in testing but introduces complications associated with the use of a hazardous material. Recently, gas chromatography has been used as a basis for diffusible hydrogen analysis. The method presented in this paper allows for degassing of a welded specimen in a closed chamber and subsequent analysis of the resulting gas mixture by gas chromatography. The method is flexible in that it allows for degassing at several temperatures and allows for analysis of the gas contained without consuming it entirely. The purpose of this paper is to outline the general method and provide experimental and analytical verification of its accuracy. It is discussed in comparison with other methods and equipment in current use, and some examples of its application are presented.

    Keywords:

    diffusible hydrogen, steel, weld, gas chromatography


    Author Information:

    Quintana, Marie A.
    Senior engineer and senior chemist, General Dynamics, Electric Boat Division, Groton, CT

    Dannecker, John R.
    Senior engineer and senior chemist, General Dynamics, Electric Boat Division, Groton, CT


    Paper ID: STP45306S

    Committee/Subcommittee: F07.04

    DOI: 10.1520/STP45306S


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