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Low heat input gas metal arc welding for dissimilar metal weld overlays part II: the transition zone

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Abstract

Dissimilar metal weld overlays (DMWOL) of nickel base alloys on low alloy steel components are commonly used in the oil and gas, petrochemical, and power generation industries to provide corrosion and oxidation resistance in a wide range of service environments and temperatures. Traditionally, dissimilar weld overlays are produced using cold or hot wire gas tungsten arc welding. This study aims to identify and evaluate potential advantages of low heat input gas metal arc welding processes over the conventional gas tungsten arc welding in the production of dissimilar weld overlays. In order to evaluate the quality of these overlays regarding resistance against hydrogen-assisted cracking, their transition zone region is investigated in this part of the publication series. Metallurgical characterization, including energy-dispersive x-ray spectroscopy, is performed on Alloy 625/grade 22 steel overlays. The transition zone is characterized by a narrow planar growth zone and steep compositional gradients from the fusion boundary towards the weld metal. Evidence of low carbon contents in the planar growth zone, as well as for carbide precipitation in the cellular growth zone was found. The microstructure in the transition zone region of the fusion zone shows characteristics known to be suitable for good resistance against hydrogen embrittlement.

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Acknowledgements

This study was supported by ExxonMobil and Fronius International through provision of materials, welding equipment, and technical support, and was performed at the Welding Engineering Laboratory of the Ohio State University.

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Authors and Affiliations

  1. Department of Joining and Coating Technology, Fraunhofer Institute for Production Systems and Design Technology IPK, Berlin, Germany

    Julian Frei & Michael Rethmeier

  2. Welding Engineering Program, Department of Material Science and Engineering, The Ohio State University, 1248 Arthur E. Adams Drive, Columbus, OH, 43221, USA

    Boian T. Alexandrov

  3. BAM - Federal Institute for Materials Research and Testing, Berlin, Germany

    Michael Rethmeier

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  1. Julian Frei
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  2. Boian T. Alexandrov
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  3. Michael Rethmeier
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Correspondence to Julian Frei.

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Recommended for publication by Commission IX - Behavior of Metals Subjected to Welding

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Frei, J., Alexandrov, B.T. & Rethmeier, M. Low heat input gas metal arc welding for dissimilar metal weld overlays part II: the transition zone. Weld World 62, 317–324 (2018). https://doi.org/10.1007/s40194-017-0539-5

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  • DOI: https://doi.org/10.1007/s40194-017-0539-5

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