In-Situ Determination of Critical Welding Stresses During Assembly of Thick-Walled Components made of High-Strength Steel
D. Schroepfer, A. Kromm, A. Hannemann, T. Kannengiesserdownload PDF
Abstract. The performance and safety of welded high-strength low-alloyed steel (HSLA) components are substantially affected by the stresses occurring during and after welding fabrication, especially if welding shrinkage and distortion are severely restrained. The surrounding structure of the whole component affects loads in the far-field superimposing with welding stresses in the near-field of the weld. In this study a unique testing facility was used to restrain shrinkage and bending while analyse multiaxial far-field loads (max. 2 MN) during assembly of thick-walled component. A novel approach for the assessment of the in-situ-measured far-field data in combination with the actual weld geometry was elaborated. For the first time, analyses of the global bending moments of restrained welds based on the neutral axis of the actual weld load bearing section were achieved. Hence, far-field measurements offered the possibility to determine critical near-field stresses of the weld crosssections for the entire joining process. This work presents the approach for far-to-near field in-situ determination of stresses in detail for the 2-MN-testing system based on an extensive experimental work on HSLA steel welds, which demonstrates sources and consequences of these high local welding stresses. Thus, it was clarified, why the first weld beads are crucial regarding welding stresses and cold cracking, which is well known, but has never been measured so far. Accompanying analyses using X-ray diffraction (XRD) after welding show effects on local residual stress distributions. These analyses indicated viable prospects for stress reduction during assembly of thick-walled HSLA steel components.
Residual Stress, Welding, Large-Scale Test, X-Ray Diffraction, HSLA Steel
Published online 9/11/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: D. Schroepfer, A. Kromm, A. Hannemann, T. Kannengiesser, ‘In-Situ Determination of Critical Welding Stresses During Assembly of Thick-Walled Components made of High-Strength Steel’, Materials Research Proceedings, Vol. 6, pp 191-196, 2018
The article was published as article 30 of the book Residual Stresses 2018
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
 T. Nitschke-Pagel, H. Wohlfahrt, The Generation of Residual Stresses due to Joining Processes, in: V. Hauk, H. Hougardy, E. Macherauch (Eds.), Residual Stress. – Meas. Calc. Eval., DGM Informationsgesellschaft mbH, 1991, pp. 121–133.
 P.J. Withers, H.K.D.H. Bhadeshia, Residual Stress. Part 2 – Nature and Origins, Mater. Sci. Technol. 17 (2001) 366–375. https://doi.org/10.1179/026708301101510087
 D. Schroepfer, A. Kromm, T. Kannengiesser, Engineering approach to assess residual stresses in welded components, Weld. World. 61 (2017) 91–106. https://doi.org/10.1007/s40194-016-0394-9
 T. Kannengiesser, T. Boellinghaus, Cold cracking tests – An overview of present technologies and applications, Weld. World. 57 (2013) 3–37. https://doi.org/10.1007/s40194-012-0001-7
 K. Satoh, Y. Ueda, H. Kihara, Recent Trends of Research into Restraint Stresses and Strains in Relation to Weld Cracking, Weld. World. 11 (1973) 133–156.
 D. Schroepfer, A. Kromm, T. Kannengiesser, Load analyses of welded high-strength steel structures using image correlation and diffraction techniques, 62 (2018) 459–469.
 M. Hirohata, Y. Itoh, Effect of Restraint on Residual Stress Generated by Butt-welding for Thin Steel Plates, in: 9th Ger. Bridg. Symp. Kyoto, Japan, 2012, pp. 1–6.
 D. Schröpfer, Adaptierte Wärmeführung zur Optimierung schweißbedingter Beanspruchungen und Eigenschaften höherfester Verbindungen, Dissertation, OVGU Magdeburg, Shaker Verlag Aachen, 2017.
 J. Klassen, T. Nitschke-Pagel, K. Dilger, Challenges in the Calculation of Residual Stresses in Thick-walled Components, in: Mater. Res. Proceedings, Residual Stress. 2016 ICRS-10, Materials Research Forum, 2016: pp. 299–304.
 T. Lausch, T. Kannengiesser, M. Schmitz-Niederau, Multi-Axial Load Analysis of Thick-Walled Component Welds made of 13CrMoV9-10, J. Mater. Process. Technol. 213 (2013) 1234–1240. https://doi.org/10.1016/j.jmatprotec.2013.01.008
 EN 10025-6: Hot rolled products of structural steels – Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered conditions, 2018.