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Influence of the weld geometry on the residual stress reduction using low transformation temperature welding consumables

  • Low transformation temperature (LTT) welding consumables offer an innovative approach to increase the fatigue strength of welded high-strength steel structures. LTT welding consumables are characterized by a martensitic phase transformation near ambient temperature, which generates compressive residual stresses in the weld and heat affected zone (HAZ). The aim is to achieve a weld geometry, which generate high compressive residual stresses at the fatigue crack critical weld toe. Longitudinal stiffeners were gas metal arc welded using a conventional welding consumable; the base material was a high strength steel S700M. A chromium-nickel alloyed LTT consumable was deposit subsequently just on front sides of the stiffeners. Different welding parameters led to varying cross sections of the weld. The residual stresses were determined using X-ray diffraction (XRD) in the crack critical HAZ. When using only the conventional, the HAZ is characterized by high tensile residual stresses. TheLow transformation temperature (LTT) welding consumables offer an innovative approach to increase the fatigue strength of welded high-strength steel structures. LTT welding consumables are characterized by a martensitic phase transformation near ambient temperature, which generates compressive residual stresses in the weld and heat affected zone (HAZ). The aim is to achieve a weld geometry, which generate high compressive residual stresses at the fatigue crack critical weld toe. Longitudinal stiffeners were gas metal arc welded using a conventional welding consumable; the base material was a high strength steel S700M. A chromium-nickel alloyed LTT consumable was deposit subsequently just on front sides of the stiffeners. Different welding parameters led to varying cross sections of the weld. The residual stresses were determined using X-ray diffraction (XRD) in the crack critical HAZ. When using only the conventional, the HAZ is characterized by high tensile residual stresses. The additional application of the LTT alloy leads to a significant reduction of the tensile residual stresses. Depending on the weld geometry, even compressive residual stresses can be observed at the weld toezeige mehrzeige weniger

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  • Huebner_ECRS 2024_LTT- weld design_Final.pdf
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Metadaten
Autor*innen:Martin Hübner, Arne Kromm, Thomas Kannengiesser
Koautor*innen:Florian Dittmann, Igor Varfolomeev
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2024
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.4 Integrität von Schweißverbindungen
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Fatigue; LTT (Low Transformation Temperature); Residual stress reduction
Themenfelder/Aktivitätsfelder der BAM:Energie
Energie / Windenergie
Veranstaltung:ECRS 2024
Veranstaltungsort:Prague, Czech Republic
Beginndatum der Veranstaltung:03.06.2024
Enddatum der Veranstaltung:07.06.2024
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:18.06.2024
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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