| The spherical tank is a large-scale, complicated shelly structure. The security of spherical tank is affected by its welding quality straightly. It is far more valuable to simulate the welding process of spherical tank using finite element analyses. Therefore, in this paper, on the basis of the thermal-elastic-plastic theory, a two-dimensional and a three-dimensional finite element numerical analyses have been systemically performed on the girth welded temperature field and stress-stain field of the spherical tank. The ANSYS non-linear finite element program is used. Moreover, FEM is used to analyze the spherical tank with the staggered joint defect. The paper covers the following aspects concerning the main work and research in the project.A two-dimensional axisymmetric finite-element model (FEM) of welding temperature field and stress-stain field has been founded and the non-linear material property (the thermo-physical properties and the mechanical properties of the material depend on the temperature) has been considered. The temperature field of real welding process, the changes of stress-stain fields in spherical tank girth welds and the residual stress distributions have been accurately simulated.A three-dimensional FEM using mobile heat source to analyze transient temperature field and welding stress-stain field in spherical tank girth welds has been founded. In thermal-elastic-plastic analysis, the non-linear material properties are also considered. The procedure code has been compiled to deal with the moving heat source by means of APDL of ANSYS. The method of element"birth and death"has been used to simulate the weld pool's melting and freezing. Finally, the distributions of welding temperature field and welding stress-stain field have been given. Further more, the results of the two-dimensional axial-symmetric FEM have been compared with the results of the three-dimensional FEM.Finite element method is used to analyze the stress field of the spherical tank...
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