TY - CONF A1 - Kromm, Arne A1 - Schasse, R. A1 - Xu, Ping A1 - Mente, Tobias A1 - Kannengießer, Thomas ED - Olden, T.-M. ED - Muransky, O. ED - Edwards, L. T1 - Influence of weld repair by gouging on the residual stresses in high strength steels N2 - Carbon arc-air gouging is a common technology when repairing defects in welded structures. Often this technique is applied in repeated cycles even on the same location of the joint. Due to the multiple heat input by gouging and subsequent re-welding, the residual stresses are strongly influenced. This can become crucial when microstructure and mechanical properties are adversely affected by multiple weld reparations. Knowledge about the relation of gouging and residual stresses is scarce but important when high strength steels, which are sensitive to residual stresses, are processed. The present study shows the effect of repair welding on a high strength steel structural element. The weld and the heat affected zone were subjected to multiple thermal cycles by gouging and subsequent repair welding. The residual stresses were determined by X-ray diffraction at different positions along the joint. The results showed that the residual stress level has increased by the repair cycles. This is most pronounced for the heat affected zone. Adapted welding procedures may prevent detrimental residual stress distributions. T2 - ICRS 2016 - 10th International Conference on Residual Stresses CY - Sydney, Australia DA - 03.07.2016 KW - Repair welding KW - Weld residual stress KW - Carbon arc-air gouging PY - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-389242 SN - 978-1-94529117-6 SN - 978-1-94529117-3 SN - 2474-395X VL - 2 SP - 169 EP - 174 PB - Materials Research Forum LLC CY - Millersville, PA, USA AN - OPUS4-38924 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schasse, R. A1 - Kannengießer, Thomas A1 - Kromm, Arne A1 - Mente, Tobias T1 - Residual stresses in repair welds of high-strength low-alloy steels N2 - Residual stresses are often the cause for cracks in weld constructions. That is why the residual stress level, induced by manufacturing process, plays a crucial role. The present study aims on the effect of multiple repair weld procedures on a high-strength structural steel S690QL. The widespread technology of carbon arc-air gouging was applied. The weld zone and the heat-affected zone (HAZ) were subjected to multiple thermal cycles by gouging and subsequent repair welding. The investigations were focused on the change of the residuals stresses, the impact on the microstructure and the changes for the mechanical properties of the repair welded joint. The residual stresses were determined by X-ray diffraction. The results have shown a significant dependence for the residual stress levels from the repair cycle. In addition, distinctive changes in microstructures and hence mechanical properties occurred. The fusion line of the repair weld and the adjacent HAZ are the most critical areas. This is where the loss of ductility is most pronounced. KW - Residual stresses KW - High-strength steels KW - Brittle fracture PY - 2015 U6 - https://doi.org/10.1007/s40194-015-0257-9 SN - 0043-2288 SN - 1878-6669 VL - 59 IS - 6 SP - 757 EP - 765 PB - Springer CY - Oxford AN - OPUS4-34974 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -