Three-dimensional Numerical Of CLAM Steel On TIG Welding

As one kind of RAFM (Reduced Activation Ferrite/Martensitic) steels, CLAM (China Low Activation Martensitic) steel is developed and its property right is completely owned by China. It is worth to be the preferred material and largely applied as the structural in China's ITER (International Thermonuclear Experimental Reactor) test blanket module. Therefore the research of CLAM steel's welding property is imperative. 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.Three dimensional finite element numerical model of butt plates welding and T-shape welding were established using FEA software——ANSYS. Dynamic simulation of the moving of the welding heat source and parametric modeling were realized by using APDL (ANSYS Parametric Design Language). Welding temperature field, welding residual stress distribution and structure distortion problem after welding were simulated and analyzed. The heat recycle of different position and the temperature distribution on conditions of different time were discussed; analyzed welding residual stress distribution along the paths and structure distortion problem after welding taking no account of the phase transition; simulative results of residual stress distribution of butt plates welding was verified by x-ray diffraction measurement and the simulating results approximately agree with the experimental results, it proved the validity of the model; the study laid a foundation for further simulation research work of CLAM TIG welding.