Ask the expert how to correct the steel structure tank, because of welding deformation, the welded joint has concave-convex phenomenon, which is quite deformed. The diameter of the tank is 12. 3 meters. thank you I suggest you find an experienced fireman in the shipyard, because even if you know the principle of calibration, it is difficult to do it well without practical experience. The key is to grasp the "temperature".

To prevent welding, more efforts should be made to prevent deformation and nip in the bud.