Method for controlling shapes, positions and sizes of flange plates at spherical bottom of 5M-level storage box

The invention provides a method for controlling the shapes, positions and sizes of flange plates at the spherical bottom of a 5M-level storage box, and aims to control the shapes, positions and sizes of the flange plates at the bottom of a large-diameter storage box. The method comprises the following steps: performing an interference fit between the flange plates in component states and corresponding flange plate mounting holes in melon petals; according to a quick welding technology, welding the assembled melon petals and flange plates to form melon petal-flange plate assembling units; sizing the melon petal-flange plate assembling units, and restoring the welding deformation of each flange plate and each melon petal.