Abstract
Gas Tungsten Arc Welding (GTAW) process is generally used for assemblies that requireshigh quality weld joint. Weldment properties rely mainly on the thermal cycle due tothe welding operation and the complex flow of molten metal in the weld pool. Betterunderstanding of the physical phenomena involved in the welding operation, more exactlyin the weld pool, are the fundamental step for improving the GTAW operation. In thepresent research work, a 2D multiphysics model was established in order to predict theweld pool shape evolution in the frame of a static GTAW using a finite element numericalapproach. In order to validate the GTAW model, an experimental set up was definedfor synchronizing the acquisition of time dependent data such as temperature, weld poolradius and welding process parameters. Then an inverse approach (Levenberg-Marquardtmethod) is used to estimate the parameters in the heat flux formulation from the availableexperimental data such as temperature and weld pool radius. The estimated parametersare in good agreement with the literature. The evaluated error on the estimated parametersis less than 10%.