From the Field to the Lab: Real Scale Assessment of Stresses in Welded Components
| Autor: | Dirk Schröpfer, Andreas Hannemann, Thomas Kannengiesser, Jonny Dixneit, Arne Kromm, Thomas Lausch |
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| Rok vydání: | 2018 |
| Předmět: |
0209 industrial biotechnology
Work (thermodynamics) Materials science Polymers and Plastics Bending (metalworking) business.industry technology industry and agriculture Metals and Alloys 02 engineering and technology Structural engineering Welding law.invention Cracking 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering Mechanics of Materials law Residual stress Ultimate tensile strength Ceramics and Composites Boundary value problem business Joint (geology) |
| Zdroj: | Materials Performance and Characterization. 7:20170103 |
| ISSN: | 2379-1365 |
| Popis: | Residual stresses are crucial when assessing the performance of welded components. The present work deals with the possibilities of transferring the real-life boundary conditions of welding, which influence the residual stress, into the laboratory. The possibilities of a test system specifically developed for this purpose, with a maximum capacity of 2 MN, are shown, because the structural design, global process, geometry, and material-dependent stresses are induced, which can be simulated and quantified within the system. Additionally, X-ray diffraction can be applied to determine the resulting local stress distribution precisely with high spatial resolution. Two examples are presented to show how the conditions to be found during production are simulated in the laboratory. It is shown how welding stresses in high-strength steels are affected by the heat control. It was possible to clarify why elevated working temperatures significantly increase the bending stresses in the welded joint and therefore the tensile stresses in the heat-affected zone. The effect of heat treatment applied under stresses resulting from welding is demonstrated by the example of a creep-resistant steel. Reheat cracking is significantly increased in this case, as compared to small-scale laboratory-based tests. |
| Databáze: | OpenAIRE |
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