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    Volume 7, Issue 4 (April 2018)

    Special Issue Paper

    Two-Dimensional Residual Stress Mapping of Multilayer LTT Weld Joints Using the Contour Method

    (Received 19 July 2017; accepted 23 October 2017)

    Published Online: 30 April 2018

    CODEN: MPCACD

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    Abstract

    Low transformation temperature (LTT) weld filler materials offer an attractive alternative to cost intensive postweld treatments as they can mitigate detrimental welding residual stresses during the welding process. Compared to conventional weld filler materials, LTT alloys are characterized by a delayed martensite transformation at low temperatures, which can result in compressive residual stresses in the weld. The high strength of these filler materials makes them potentially applicable to high-strength steels as well as for a large amount of requested repair works in steel structures. The focus of the study is on the confirmation of the LTT idea with regard to the residual stress state for multipass weld lines processed by metal active gas welding. It is demonstrated that the contour method is a well-suited technique for measuring the residual stress in the weld joint as it gives an entire two-dimensional map of the residual stress state in the weld line, heat affected zone (HAZ), and base material. The technique was applied at different LTT alloys with varying chemical compositions. Additionally, the results are compared to residual stress maps that were determined by neutron diffraction using the Strain Analyzer for Large Scale Engineering Applications, an instrument referred to as SALSA, at the Institut Laue-Langevin in Grenoble. For all investigated specimens, compressive residual stress distributions were determined in the area of the weld joint and the HAZ. They are balanced by tensile residual stresses in the surrounding base material. However, it is shown that the size of the region exhibiting compressive residual stresses and the absolute values of the compressive residual stresses depend on the chemical composition of the weld filler material.

    Author Information:

    Vollert, Florian
    Institute of Applied Materials, Karlsruhe Institute of Technology, Karlsruhe,

    Gibmeier, Jens
    Institute of Applied Materials, Karlsruhe Institute of Technology, Karlsruhe,

    Rebelo-Kornmeier, Joana
    Technische Universität München, Forschungsneutronenquelle Heinz Maier-Leibnitz, München,

    Dixneit, Jonny
    Bundesanstalt für Materialforschung und –prüfung, Berlin,

    Pirling, Thilo
    Institut Laue-Langevin, Grenoble,


    Stock #: MPC20170110

    ISSN:2379-1365

    DOI: 10.1520/MPC20170110

    Author
    Title Two-Dimensional Residual Stress Mapping of Multilayer LTT Weld Joints Using the Contour Method
    Symposium ,
    Committee E28