TY - JOUR A1 - Frei, J. A2 - Alexandrov, B. T. A2 - Rethmeier, Michael T1 - Low heat input gas metal arc welding for dissimilar metal weld overlays part III: hydrogen-assisted cracking susceptibility T2 - Welding in the World N2 - Dissimilar metal weld overlays 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 such overlays. Parts I and II of this publication series described characteristics of the heat-affected zone and the transition zone region of alloy 625 on grade 22 steel overlays. These results indicate a good resistance against hydrogen-assisted cracking, which is being verified within this third part of the publication series. To determine the hydrogen-assisted cracking susceptibility, welded samples are tested using the delayed hydrogen-assisted cracking test. Fractography is performed using scanning electron microscopy along with energy dispersive spectroscopy. The results confirm the suitability and efficiency of low heat input gas metal arc welding for dissimilar weld overlays. Variation of the postweld heat treatment procedure bears potential for improvement in this respect. PB - Springer KW - Low heat input GMA welding KW - Dissimilar metal weld overlays KW - Coarse-grained heat-affected zone KW - Grain size KW - Microstructure KW - Fusion Zone KW - Nickel alloys PY - 2018 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/47236 AN - OPUS4-47236 SN - 0043-2288 SN - 1878-6669 SP - 1 EP - 8 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany