Welding Simulation Analysis And Experimental Verification Of ITER Feeder System

International Thermonuclear Experimental Reactor (ITER) is the largest international cooperation project currently in the world; the goal is to build a large Tokamak experiment reactor which could self-sustaining combustion for proving the feasibility of the nuclear fusion reactor. Feeder system is one of the most important systems of ITER, whose design and manufacture will be completed by China. The system consists of pipe, cable and wire, which supplies power, cooling, measurement, control, diagnosis respectively for the magnet coil system, such as PF. The production, manufacture, experiment of the Feeder prototype are carrying out now. The manufacturing level will directly affect the security and the stability of the ITER. The welding procedure is a significant method of thermal processing, and is the main method to join materials in production and manufacturing process. The quality of welding will directly affect the quality of the device.Firstly, the thesis design the welding processes of some key parts in ITER feeder structure, and put forward optimization schemes of partial structure and process, and then do finite element mechanism simulation analysises by using the professional welding simulation software SYSWELD which is based on the thermal elasto-plastic analysis method, get the distribution of the temperature in welding and the distribution of the residual stress and equivalent deformation after welding in different welding process. Finally, conduct the experiments of the welding process according to the designed welding procedure, and compare with the simulation results of welding simulation which prove the simulation results of designed welding procedure are rather tally with the results of the experiments. The theses synthesize the data in all aspects, and choose the best structure and welding process to the actual welding process, to guide the production of the device.The research results of the thesis will lay the technical foundation for the welding and manufacture of the ITER feeder prototype, provides experience for welding process design and welding analysis to other parts of ITER feeder, and provides basises of the production of ITER feeder.