Welding Deformation Prediction Of Large Nuclear Power Stainless Steel Pool And Development Of The Inherent Deformation Database

Welding deformation preventive measures and corrective processes rely mainly on experience and limited experimental data which is insufficient to accommodate the complex structure and welding methods. What’s more, correction of welding deformation is extremely time-consuming. Finite element numerical calculation is an effective means of predicting welding deformation, but the thermal elastic-plastic finite element calculation of the large complex structures are very time-consuming and tedious by using finite element software. Using inherent strain method in large structure can realize a rapid and accurate prediction. A large number and accurate inherent deformation date of typical joints is the key to predict the deformation of large structure. So, inherent deformation database is important to set up.A typical joint welding test has been carried out with the collection of dynamic temperature and deformation of welding process; Efficient thermal elastic-plastic numerical calculation methods have been studied and obtained the welding temperature field and deformation of typical welding joints while comparing with the experimental date; The numerical inherent strain accuracy of typical joints have been verified based on the inverse analysis and analyzed the influencing factors of inherent deformation and rules; Finally, the deformation of a nuclear stainless steel pool has predicted and the inherent strain database has been set up. The results show that:(1) Based on thermal elastic-plastic finite element method, combined with efficient algorithms and the optimization model, it can obtain the deformation of small stainless steel joints accurately, which will obtain the accurate inherent strain;(2) By comparing the thermal elastic-plastic calculation results of small joints with inherent strain elastic simulation results by two different software, it verify the accuracy of the inherent strain; The inherent strain method is suitable for prediction of the small joint deformation by inverse analysis;(4) The influence of constraint location in the result of inherent strain is not significant;The size of subplate has effect on the temperature field of welding process that has a large influence of final deformation and inherent deformation; The thickness of plate and heat input have a significant effect on the inherent deformation.(5) Using inherent strain method can efficiently predict the deformation of large nuclear power stainless steel pool. Through the geometry modeling, meshing and adding welds, it obtain the deformation of large nuclear power stainless steel pool by welding deformation forecast analysis system;...