In this study, we performed a numerical simulation and experimental measurements on a steel circular patch welded structure to investigate the temperature and residual stress field distributions caused by the application of buried-arc welding technology. The temperature histories during the welding and subsequent cooling process were recorded for two locations, with the thermocouples mounted inside the plate close to the weld bead. On the upper surface of the welded model, the temperature-time changes during the cooling process were monitored using an infrared camera. The numerically calculated temperature values correlated well with the experimentally measured ones, while the maximum deviation of the measured and calculated temperatures was within 9%. Based on the numerical result analysis regarding circumferential and radial stresses after the completion of the welding process, it is concluded that both stresses are primarily tensile within the circular disk. Outside the disk, the circumferential stresses turn from tensile to compressive, while on the other hand the radial stresses disappear towards the ends of the plate.
Research was conducted in the vineyard grown in artificially transformed karst terrain (Croatia). The experimental design included four irrigation treatments in three replicates. Temperature measurements were carried out using an infrared thermal imaging camera. Biological properties, such as the leaf water potential (LWP) were also measured. The obtained crop water stress index (CWSI) values and the measured LWP values were used to create multiple regression models. It was concluded that if an automatic thermal imaging method which produced thermal images of sufficiently high quality is used, then the automatic method for the calculation of CWSI developed here is confidently applicable.
This paper presents a numerical and experimental study of residual stresses and distortions induced by the Tjoint welding of two plates. Within the framework of numerical investigations a thermo-mechanical finite element analysis is performed by using a shell/three-dimensional modeling technique to improve both the computational efficiency and the accuracy. The influence of the choice of the local 3D model size on the temperature distribution, residual stresses and displacements is investigated. In order to validate numerical model, a series of experiments using fully automated welding process are conducted. Thermographic camera and optical measurement system is used to measure temperature and displacement distributions.
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