TY - CONF A1 - Hübner, Martin A1 - Kromm, Arne A1 - Kannengiesser, Thomas A1 - Dittmann, Florian A1 - Varfolomeev, Igor T1 - Influence of the weld geometry on the residual stress reduction using low transformation temperature welding consumables N2 - Low transformation temperature (LTT) welding consumables offer an innovative approach to increase the fatigue strength of welded high-strength steel structures. LTT welding consumables are characterized by a martensitic phase transformation near ambient temperature, which generates compressive residual stresses in the weld and heat affected zone (HAZ). The aim is to achieve a weld geometry, which generate high compressive residual stresses at the fatigue crack critical weld toe. Longitudinal stiffeners were gas metal arc welded using a conventional welding consumable; the base material was a high strength steel S700M. A chromium-nickel alloyed LTT consumable was deposit subsequently just on front sides of the stiffeners. Different welding parameters led to varying cross sections of the weld. The residual stresses were determined using X-ray diffraction (XRD) in the crack critical HAZ. When using only the conventional, the HAZ is characterized by high tensile residual stresses. The additional application of the LTT alloy leads to a significant reduction of the tensile residual stresses. Depending on the weld geometry, even compressive residual stresses can be observed at the weld toe T2 - ECRS 2024 CY - Prague, Czech Republic DA - 03.06.2024 KW - LTT (Low Transformation Temperature) KW - Residual stress reduction KW - Fatigue PY - 2024 AN - OPUS4-60305 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -