TY - CONF A1 - Schröpfer, Dirk A1 - Kannengießer, Thomas T1 - Online Monitoring of Reaction Forces and Stresses in Welded Components T2 - Proceedings of VISUAL-JW 2014 N2 - Today’s light weight design trends lead to a growing application of high-strength structural steels (yield strength ≥ 690 MPa). The mechanical properties of the weld and the component safety have to meet the increased requirements of these steel grades. However, high residual stresses in welded components are detrimental to their safety and integrity. Analyses concerning weld stresses in high-strength steels welded under component related restraint conditions revealed that heat control significantly affects global and local stresses. This occurs especially in highly restrained joints due to superimposing local and global stresses and may cause crack-critical stress-levels. In this study weld tests were performed with plates of high-strength steel in a special test facility. The experimental setup allowed transferring defined restraint conditions to the test welds similarly to real components. Temperature and reaction forces due to restraint were observed online while welding and cooling of multilayer-component MAG-welds. Mobile X-ray diffraction was used for local stress determination in the weld seam areas of the restrained specimens. It was found that interpass temperature has a major influence on the local and global welding forces and stresses. Thus, among the analysed results especially transverse residual stresses of the heat affected zone were strongly affected. T2 - The International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation CY - Osaka, Japan DA - 26.11.2014 KW - Residual Stress KW - GMA welding KW - High-strength steel PY - 2014 VL - 2014, Volume 1 SP - 115 EP - 116 PB - Joining and Welding Research Institute, Osaka University CY - Osaka AN - OPUS4-47716 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -