TY - CONF A1 - Quackatz, Lukas A1 - Griesche, Axel A1 - Kannengießer, Thomas A1 - Treutler, Kai A1 - Wesling, Volker T1 - In situ measurement of chemical concentrations in the weld during TIG welding of Duplex stainless steels for phase distribution analysis N2 - The combination of high corrosion resistance and good mechanical properties of duplex steels (DSS) is due to their chemical composition and the balanced phase ratio of ferrite (α) and austenite (γ). Many industrial applications require a material joint of DSS. Tungsten inert gas (TIG) welding is relatively easy to use, requires little space and allows automated welding, with very high reproducibility and is therefore excellent for welding DSS. During solidification of these steels, critical phase ratios of α and γ can occur, leading to solidification cracking, susceptibility to corrosion, lower ductility, and critical strength values. Therefore, to obtain the desired material properties, the α/γ distribution must be reliably predicted. This is usually done using the WRC1992 diagram. However, the prediction accuracy of the ferrite content in this diagram is usually not accurate enough and must therefore be optimized. It is therefore necessary to monitor even the smallest changes in the chemical composition of the weld metal, ideally during welding. This is done in these experiments using Laser-induced Breakdown Spectroscopy (LIBS). A major advantage of this technique is the highly accurate time- and spatially-resolved measurement of chemical composition during welding. Previous work has quantified the chemical composition in the weld metal and heat affected zone. In the presented study, the influence of individual elements, such as Nb and Cu, on the resulting weld microstructure is investigated. T2 - IIW Intermediate Meeting 2023 CY - Hachenburg, Germany DA - 27.02.2023 KW - LIBS KW - Duplex Stainless Steel KW - WRC 1992 diagram KW - TIG welding PY - 2023 AN - OPUS4-57079 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -