Three-dimensional Numerical Simulation Of Temperature Fields And Stress Fields Of CLAM Steel

China Low Activation Martensitic steel—CLAM steel is being developed in Institute of Plasma Physics,Chinese Academy of Science, under wide collaboration with many other domestic and foreign institutes and universities,and is considered as the primary candidate structural material for test blanket modules of ITER(International Thermonuclear Experimental Reactor) project.CLAM steel welding procedure and Welding Techniques are related to whether TBM(test blanket modules) production will success finally and which are also one of the key technologies that CLAM steel trend towards practical applications.At present,primary study on hot isostatic pressing diffusion welding has been carried out in china,in order to satisfy the requirements of fusion reactors blanket module development,the other welding process such as laser welding,argon arc welding,electron beam welding and the welding thermal simulation technique are especially important and urgent.Based on this background,the paper had the preliminary study tempreture field, stress and strain fields of CLAM TIG welding by combining finite element analysis with text method.Three dimensional finite element numerical model of two-pass welding by one side under butt joint condition was established using FEA software—ANSYS.Dynamic simulation of the moving of the welding heat source,the filling of welding material step by step and Parametric Modeling were realized by using APDL(ANSYS Parametric Design Language)and life-death element technique.Welding temperature field, welding residual stress distribution and structure distortion problem after welding were simulated and analyzed.The temperature distribution on conditions of different time and process parameters;the heat recycle of different position and the dynamic change process of weld pool were discussed;analyzed the microstructures and micro hardness of the weld seam;simulative results of temperature field are verified by infrared temperature measurement and the simulating results approximately agree with the experimental results,it proved the validity of the model;the paper also analyzed welding residual stress distribution along the paths and structure distortion problem after welding taking no account of the phase transition,the study laid a foundation for futher simulation research work of CLAM TIG welding.