Application of vibration stress relief in CFETR vacuum vessel welding

Several welding methods are used in the manufacturing of the CFETR vacuum vessel. These welding methods will inevitably lead to the problems of welding residual stress and welding distortion. Relieving welding residual stress is one of the important works in CFETR vacuum vessel welding and vibration stress relief (VSR) is one of the methods to relief the residual stress in the welding of the CFETR vacuum vessel. In this paper, the vacuum vessel PS3 segment is selected as the research object, and the VSR technology such as excitation point and support regions, excitation force and excitation frequency can be obtained through software simulation combined with the actual situation, which provides technical guidance for improving the effect of residual stress relieving.