Stress Build-Up during Multilayer Welding with Novel Martensitic Filler Materials*
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A. Kromm
Abstract
Controlling the level of mostly detrimental residual stresses already during the welding process would be highly attractive as time and cost consuming post processing may be prevented. Innovative Low Transformation Temperature (LTT-) filler materials are specially designed for controlling weld residual stresses by means of adjusted martensite formation already during welding. Numerous publications can be found on this issue, but they provide only little insight into the interaction between martensite formation and resulting welding residual stresses. Within this study a component weld test was performed in a special large-scale testing facility. In-situ load analysis revealed that the amount of stress reduction during deposition of the individual weld runs is dependent on the weld volume undergoing phase transformation related to the shrinking volume. The residual stresses found after welding show that the desired residual stress control by using LTT alloys is sensitive to welding boundary conditions (i. e. weld geometry, plate thickness) and to be evaluated separately for varying weld scenarios.
Kurzfassung
Neuartige sogenannte Low-Transformation-Temperature (LTT)- Schweißzusätze weisen eine chemische Zusammensetzung auf, welche die Martensitbildung zu vergleichsweise niedrigen Temperaturen verschiebt. Dies wirkt sich maßgeblich auf die nach dem Schweißen vorliegenden Eigenspannungen aus. Obwohl dazu zahlreiche Veröffentlichungen vorliegen, blieben die Wirkzusammenhänge zwischen Umwandlungstemperatur und Schweißeigenspannungen bislang ungeklärt. Aus diesem Grund wurde in der vorliegenden Arbeit ein Versuch in einer Großprüfanlage durchgeführt, um den Einfluss der Martensitumwandlung während des Mehrlagenschweißens zu analysieren. Die In-Prozess-Beobachtung der auftretenden Kräfte und Momente offenbarte, dass die Eigenspannungsreduktion vom jeweils umwandelnden Volumen abhängt. Die Analyse der Schweißeigenspannungen verdeutlichte, dass die angestrebte Eigenspannungsbeeinflussung durch den Zusatzwerkstoff stark von den Randbedingungen (d. h. Nahtaufbau, Blechdicke) abhängt und einer Bewertung im jeweiligen Anwendungsfall bedarf.
References
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© 2014, Carl Hanser Verlag, München
Artikel in diesem Heft
- Veranstaltungen/Events
- Veranstaltungen in Zusammenarbeit mit der AWT
- HTM-Praxis
- HTM-Praxis
- Kurzfassungen/Abstracts
- Kurzfassungen
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Preface
- Residual Stress in the Cementite Phase of Cold Drawn Pearlite*
- Residual Stress Analysis of Thick Film Systems by the Incremental Hole-Drilling Method*
- Stress Build-Up during Multilayer Welding with Novel Martensitic Filler Materials*
- Characterization of Residual Stress Evolved in Iron-Based Shape Memory Alloys*
- Microstructure and Properties of Pearlitic Steel during Cold Wire Drawing: A Residual Stress Perspective*
- Shot Peening Induced Plastic Deformation in Cast Iron – Influence of Graphite Morphology*
- Heat Treatment Effects of Laser Cladded 12 Ni Maraging Tool Steel with Ni-Co-Mo Alloys*
Artikel in diesem Heft
- Veranstaltungen/Events
- Veranstaltungen in Zusammenarbeit mit der AWT
- HTM-Praxis
- HTM-Praxis
- Kurzfassungen/Abstracts
- Kurzfassungen
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Preface
- Residual Stress in the Cementite Phase of Cold Drawn Pearlite*
- Residual Stress Analysis of Thick Film Systems by the Incremental Hole-Drilling Method*
- Stress Build-Up during Multilayer Welding with Novel Martensitic Filler Materials*
- Characterization of Residual Stress Evolved in Iron-Based Shape Memory Alloys*
- Microstructure and Properties of Pearlitic Steel during Cold Wire Drawing: A Residual Stress Perspective*
- Shot Peening Induced Plastic Deformation in Cast Iron – Influence of Graphite Morphology*
- Heat Treatment Effects of Laser Cladded 12 Ni Maraging Tool Steel with Ni-Co-Mo Alloys*
