Results of EC FP7 Structural Performance of MULTI-METAL Component Project: Dissimilar Metal Welds Fracture Resistance Investigation

Heikki Keinänen, Elisabeth Keim, Päivi Karjalainen-Roikonen, Sébastien Blasset, Philippe Gilles, Tomas Nicak

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    3 Citations (Scopus)


    The purpose of this paper is to disseminate the results of an EURATOM project MULTI-METAL focusing on the structural integrity assessment of dissimilar metal welds. The project started in February 2012 and ended in February 2015. The project is coordinated by VTT with 10 partner organizations from Europe : Technical Research Centre of Finland, Finland (VTT) – Coordinator, AREVA NP, France and Germany (ANP), Commissariat à l’Énergie Atomique et aux energies alternatives, France (CEA), Joint Research Centre of the European Commission, Belgium (JRC), EdF-Energy, United Kingdom (BE), Bay Zoltán Foundation for Applied Research, Hungary (BZF), Electricité de France, France (EDF), TECNATOM, Spain (TEC), Jožef Stefan Institute, Slovenia (JSI), Studsvik Nuclear AB, Sweden (STU). The underlying aim of the project is to provide recommendations for a good practice approach for the integrity assessment (especially testing) of tough dissimilar metal welds as part of overall ductile integrity analyses; this has been presented in the project overview [1]. Experience on typical DMWs concerning manufacturing, residual stresses, flaw assessment and testing have been reviewed. The specimens were taken from mock-ups of welded plates. Three DMWs design variants have been covered: narrow gap DMW with Ni-52, DMW with austenitic steel buttering and a DMW with Nienriched austenitic steel buttering. Mechanical characterization and fracture mechanics testing (CT, SEN(B) and SEN(T) specimens) have been performed. Interpretation of the test has required numerical analysis since the standard ASTM E1820 [2] (CT, SEN(B)) and guidelines dealing with SEN(T) [3][4] are not directly intended to cover DMW.
    Original languageEnglish
    Title of host publicationASME 2015 Pressure Vessels and Piping Conference
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Number of pages12
    ISBN (Print)978-0-7918-5699-4
    Publication statusPublished - 2015
    MoE publication typeA4 Article in a conference publication
    EventASME 2015 Pressure Vessels and Piping Conference, PVP 2015 - Boston, United States
    Duration: 19 Jul 201523 Jul 2015


    ConferenceASME 2015 Pressure Vessels and Piping Conference, PVP 2015
    Abbreviated titlePVP 2015
    Country/TerritoryUnited States


    • alloy 52 DMW
    • ASTM E1820
    • dissimilar metal welds
    • EBSD
    • fracture toughness
    • mismatch
    • nuclear materials
    • VVER DMW


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