Abstract
The large number of welds and the achievement of tight tolerances defined for the ITER vacuum vessel (VV), require improvements in the manufacturing strategy to minimize the welding distortion. The influence of clamping on welding distortion has been determined for one of the VV prototypes manufactured by AMW consortium, the ‘poloidal segment two’ (PS2) mock-up. Clamping influence was evaluated, and improvements in clamps for the mock-up were obtained, using finite element simulation of the welding and assembly process, based on detailed thermo-mechanical transient non-linear analysis (welding distortion analysis).The results of simulation are presented along with the experimental measurements. The results and improvements obtained from simulation, presented in this article, and demonstrated during PS2 mock-up manufacture have been used to improve the jig design of the real VV - PS2.
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