In situ analysis of the strain evolution during welding using low transformation temperature filler materials |
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| Authors: | Jonny Dixneit Florian Vollert Arne Kromm Jens Gibmeier Andreas Hannemann Torben Fischer |
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| Affiliation: | 1. Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germanyjonny.dixneit@bam.de;3. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), Karlsruhe, Germany;4. Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany;5. Helmholtz-Zentrum Geesthacht (HZG), Institute of Materials Research, Geesthacht, Germany |
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| Abstract: | ABSTRACTCompared to conventional welding consumables using low transformation temperature (LTT) filler materials is an innovative method to mitigate tensile residual stresses due to delayed martensite transformation of the weld. For the effective usage of LTT filler materials, a deeper understanding of the complex processes that lead to the final residual stress state during multi-pass welding is necessary. Transformation kinetics and the strain evolution of multi-pass welds during welding were investigated in situ at the beamline HEMS@PETRAIII, Germany. Compared to conventional welds, the total strain was reduced and compression strain was achieved when using LTT filler materials. For an optimal use of the LTT effect in the root of multi-pass welds, the alloying concept must be adapted taking care of dilution. |
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| Keywords: | Low transformation temperature filler materials dilution phase transformation multi-pass welding GMAW strain synchrotron diffraction ADXRD |
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