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Welding stress control in high-strength steel components using adapted heat control concepts

  • Dirk SchroepferEmail author
  • Arne Kromm
  • Thomas Schaupp
  • Thomas Kannengiesser
Research Paper
  • 52 Downloads

Abstract

High-strength steels are increasingly applied in modern steel constructions to meet today’s lightweight requirements. Welding of these steels demands a profound knowledge of the interactions between the welding process, cooling conditions, heat input, and the resulting metallurgical occurrences in the weld and its vicinity. Additionally, welding stresses may be detrimental for the safety and performance of high-strength steel component welds during fabrication and service, especially due to the high yield ratio. For a development of strategies to adjust welding heat control, all these effects should be considered, to reach a complete exploitation of the high-strength steel potential. In recent researches at BAM, multilayer GMAW experiments were performed with high-strength steels, in which cooling conditions and resulting microstructure were analyzed for varied heat control parameters. The application of a unique 3d-operating testing facility and X-ray diffraction measurements allowed the analysis of local stresses in the weld while welding and cooling under component relevant shrinkage restraints. As a result, correlations between material behavior, welding, and cooling condition and the arising multi-axial stresses and forces were found. Based on this study, statements for the development of adapted heat control concepts were derived, which are presented by means of specific analysis examples.

Keywords

Residual stresses GMA welding Restraint High-strength steels Process parameters 

Notes

Funding information

The studies were funded by the AiF-project projects IGF-Nr. 17267 N/FOSTA P922 and IGF-Nr. 17978 N/FOSTA P1011. Sincere thanks are given for this support and to the representing companies actively involved in the project board.

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Copyright information

© International Institute of Welding 2018

Authors and Affiliations

  1. 1.Bundesanstalt für Materialforschung und -prüfung (BAM)BerlinGermany

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