Finite Element Analysis of Temperature Filed and Stress Field of Reducer

The connection mode of reducer with straight tube on both sides are the welding connection. There are two weld at the both side of reducer and there has a great influence on residual stress and deformation in the process of welding. Based on the particularity of reducer welding, the paper is focus on the residual stress and deformation in the process of welding, using large-scale finite element analysis software ANSYS. The DN500X450 reducer model is established. The welding temperature field and residual stress field is analysis and calculation and analysis the influence on temperature and stress distribution of reducer. The results show that the maximum of the temperature and the residual stress is located in the big side and reduce the welding seam, and the obvious deformation also find in the big side and reduce joint. The reducing pipe's distribution of temperature field and residual stress field are obtained,providing the basis to establish properly and optimize of welding process.