Abstract
Thermal and residual stress distributions induced by the gas tungsten arc welding (GTAW) process on Inconel 625 were studied using numerical simulation and experiments. A multi‐pass welding model was developed that uses a volumetric heat source. Thermomechanical analysis is carried out to assess the Thermal and residual stress distributions. Experiments were carried out with 5 mm thick Inconel 625 plates. X‐ray diffraction techniques were used to measure residual stresses, and IR thermometry was employed to capture the temperature values on the welded joints. Simulations were performed with ANSYS numerical code, and a close agreement was found between the predicted and experimentally measured residual stress. Thermal measurements were collected pass by pass from the analysis, and the agreement was 9.08%. The agreement between the measured and analysed residual stress was 11%.
Highlights
Fusion welding is one of the major joining techniques employed in industrial applications
Balram and Rajalakshmi [2] reported the experimental results regarding thermal stresses and thermal fields developed in the gas tungsten arc welding (GTAW) process applied to similar and dissimilar welded joints. e ERNiCrMo-3 alloy was used as filler wire
The pass-3 produced a maximum temperature of 1707°C. e maximum temperature was experimentally seen at the weld zone of the real joints. e heat is collected at the weld zone of the joint and extends in the transverse direction, which leads to form the heat-affected zone (HAZ)
Summary
Fusion welding is one of the major joining techniques employed in industrial applications. Korrapati et al [3] investigated the weldability and metallurgical and mechanical properties of the PCGTA welded Inconel 625 alloy employing ERNiCrMo-3 filler wire In this case, despite the fact that defect-free welded joints were obtained, failures occurred at the weld region and the average tensile strength of the weldments was found to be 852.4 MPa. In order to decrease the computational time without losing accuracy, Pericet al. Since no work has been published on the in situ thermal behaviour study during GTAW for Inconel 625 material, the authors believe that there is a lack of confirmation on simulations for the estimate of temperature profiles and residual stresses. X-ray diffraction is used to evaluate residual stresses in a weldment after it has cooled to ambient temperature for verification
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