关键词: ITER, U型支撑夹, TIG焊, 整体环形锻造, 线切割

Abstract:  Dimensional accuracy and mechanical properties for U-shaped supporting clamps for ITER magnet support (PFCS2), fabricated with the welding process and the integral ring forging plus wire-electrode cutting process respectively, were studied. The final dimension of U-shaped clamp, manufactured by double-sided TIG welding and single-sided TIG welding of components with the help of various auxiliary tools and heat treatment, can be controlled within the required range, but the impact of the welds at 77K is less than 100J. By adopting the integral ring forging plus slot wire-electrode cutting process, the opening size and slot size of the U-shaped clamp can meet the tolerance requirements, meanwhile, the consistency of the material properties is guaranteed, and the mechanical properties of the U-shaped clamp are improved. The integral ring forging plus wire-electrode cutting process is finally recognized by ITER International Organization (IO) as the mass production method for U-shaped clamps.

Key words:

 ITER, U-shaped clamp, TIG welding, Integral ring forging, Wire-electrode cutting