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Residual Stress Evolution During Slot Milling for Repair Welding and WAAM of High-Strength Steel Components

  • High-strength steels have great potential for weight optimization due to reduced wall thicknesses in many modern steel constructions. Further advances in efficiency can be achieved through the application of additive manufacturing processes, such as Wire Arc Additive Manufacturing (WAAM). These technologies enable the sustainable and resource-efficient manufacturing of high-strength steels into near-net-shape, efficient structures. During the production of steel structures, unacceptable defects may occur in the weld area or in the WAAM component, e.g., due to unstable process conditions. The economical solution for most of the cases is local gouging or machining of the affected areas and repair welding. With respect to the limited ductility of high-strength steels, it is necessary to clarify the effects of machining steps on the multiaxial stress state and the high design-induced shrinkage restraint. In this context, the component-related investigations in two research projects areHigh-strength steels have great potential for weight optimization due to reduced wall thicknesses in many modern steel constructions. Further advances in efficiency can be achieved through the application of additive manufacturing processes, such as Wire Arc Additive Manufacturing (WAAM). These technologies enable the sustainable and resource-efficient manufacturing of high-strength steels into near-net-shape, efficient structures. During the production of steel structures, unacceptable defects may occur in the weld area or in the WAAM component, e.g., due to unstable process conditions. The economical solution for most of the cases is local gouging or machining of the affected areas and repair welding. With respect to the limited ductility of high-strength steels, it is necessary to clarify the effects of machining steps on the multiaxial stress state and the high design-induced shrinkage restraint. In this context, the component-related investigations in two research projects are concerned with the residual stress evolution during welding and slot milling of welds and WAAM structures made of high-strength steels with yield strengths ≥790 MPa. In-situ digital image correlation (DIC) and ex-situ X-ray diffraction (XRD) were used to analyse the stresses and strains induced on specimens during and after milling. The systematic analyses revealed a significant interaction of the stiffness and relaxation of the specimens with the initial residual stresses induced by welding.zeige mehrzeige weniger

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Metadaten
Autor*innen:Karsten WandtkeORCiD
Koautor*innen:Amadeus Becker, Dirk Schröpfer, Arne Kromm, Thomas Kannengießer, R. Scharf-Wildenhain, A. Hälsig, J. Hensel
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2022
Organisationseinheit der BAM:9 Komponentensicherheit
9 Komponentensicherheit / 9.2 Versuchsanlagen und Prüftechnik
9 Komponentensicherheit / 9.4 Integrität von Schweißverbindungen
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Additive Fertigung; Eigenspannungen; Gefügedegradation; Hochfester Stahl; MAG-Schweißen; Reparaturschweißen; Windenergie
Themenfelder/Aktivitätsfelder der BAM:Energie
Material
Material / Additive Fertigung
Material / Degradation von Werkstoffen
Veranstaltung:ICRS 11 - The 11th International Conference on Residual Stresse
Veranstaltungsort:Nancy, France
Beginndatum der Veranstaltung:27.03.2022
Enddatum der Veranstaltung:30.03.2022
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:22.12.2022
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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