The Study of Residual Thermal Stress and Deformation in the Weldment Using Sysweld
| Autor: | Ying-Cheng Liu, 劉盈成 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 In this study, the welding process simulation software, SYSWELD, is used to conduct the simulation of a tungsten inert gas (TIG) welding process using two combinations alloys. The two groups of materials are 316L/ER308/316L and 316L/Incoly82/A508 and all of these materials are widely used in nuclear power plants. In addition, experiments are carried out to support the simulation results. By comparing the shape of weld pools, residual stresses, and displacements of both results, the accuracy of the simulation results can be confirmed. The research is composed of two parts, actual experiments and computer simulations. For the actual experiments, the samples is prepared by outsourcing. After getting sample, using the ruler to measure the displacements of sample’s four edge and the High Speed Hole-Drilling Method is subsequently carried out to measure residual stresses of the sample. After finishing the above procedures, observing the shape of weld pool by metallographical analysis. On the other side, the computer simulation is divided into three steps, modeling, solving, and observing the results. First, finite element method (FEM) model with 15,000 meshes of workpiece is established by using the Visual-Mesh, and the weld bead of workpiece is single grooved with 60 degree. Second, the actual process parameters are input to Visual-Weld and then simulate the welding process by SYSWELD. After solving, simulation results can be displayed on Visual-Viewer for comparing both results. The results of actual experiment and simulation indicate that the both displacement and the shape of weld pool are approximately equal. Through the simulation results, the temperature and stress field can be much more clearly. Therefore, the SYSWELD welding process simulation shows potential for industrial applications. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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