Numerical Modeling Of The Electron Beam Welding For Port Stub Of Cfetr Vacuum Vessel

The port stubs are larger welding parts of stainless steel plate, featuring with complicated structure and big overall dimensions contain complex local flanging shape and demand high forming quality. It is very important to forecast the welding stress and control the welding residual deformation exactly to ensure the safe reliability of the structure. In this paper, the welding distortions of port stub were predicted by inherent strain method and the welding sequence and clamping design were optimized. Three possible welding constraints and three welding sequence schemes of the port stub were provided within the actual processing condition, weld distortions were studied. Finally, the smallest welding deformation was under welding constraints 3, welding sequence 1, and the maximum welding deformation was 2.968 mm. The simulations were used to guide the manufacture of the final sequence and clamping design of the port stubs.