Numerical Simulation Of Welding Temperature Field And Stress Field Of T-joint

Welding is a complicated physicochemical process which involves in electromagnetism, heat transferring, metal melting and solidifying, phase-change, welding stress and deformation and so on. In order to get high quality welding structure, these factors have to be well controlled. If welding process can be simulated by computer, we will easily determine the optimum construction design, technological process and weldmg parameter .T-joint is widely used in the welded structure. It is used not only in industries products , such as ships, automobiles, trains and bridges but also in the important structure, such as energy sources engineering, ocean engineering, spaceflight engineering, oil chemical engineering, large-scale workshop and high buildings. It is more complex than two-board butt joint welding and it has no symmetry. The study of numerical simulation in T-joint is fewer and it requires high welding quality in practical application to ensure safety. So it is necessary to do more research in this field. This paper focuses on numerical simulation of T-joint welding in welding temperature field, stress and deformation by finite element software ANSYS based on the theory of thermal elastic-plastic. The welding temperature at any time is obtained. The stress during welding and the residual stress are obtained. Compare the difference of the temperature field in different temperature. Following contents are included in this paper:1. Three-dimensional model of T-joint is developed to simulate welding temperature field, stress and deformation. In order to solve the problem and improve solution accuracy, this paper chooses suitable material property parameter, uses transition mesh to ensure it has a fine grid in the welding zone, and chooses suitable time step. It uses the method of "birth and death" method to simulate temperature field in the moving heat source.2. Welding temperature field and stress, strain field are bi-directional couple, but the influence of stress and strain field on temperature is little and the calculating ability of computer is limited, so this paper only considers the single couple which temperature field effects on stress and strain field. When calculating, firstly calculate temperature field and save the result, then use the temperature result as load to calculate welding stress and deformation. Then, the temperature field were introduced to do elastic analysis.3. Analyze the welding temperature field at different time and welding heat recycle curve of different points. Compare the distribution of welding temperature field and heat recycle of some points at different welding speed. Analyze the temperature cure of different time along welding line. Analyze the welding stress and residual stress of T-joint. It provides designer with reference to optimize welding structure.