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. Kannengiesser

doi:10.21741/9781945291890-30

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. Kannengiesser

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.

Keywords
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

DOI: https://dx.doi.org/10.21741/9781945291890-30

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.

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