At present, steel structure manufacturing has been widely used in factory buildings. The main components of steel structure workshop are welded H-steel columns, beams and braces. There are welding deformation problems in the manufacturing process of these components. If the welding deformation is not corrected, it will not only affect the overall installation of the structure, but also reduce the safety and reliability of the project.

The commonly used correction methods in the production process mainly include mechanical correction, flame correction and comprehensive correction. However, flame correction is a difficult work to operate. If the method is mastered and the temperature is not controlled properly, new and greater deformation of components will be caused. Therefore, the flame correction should have rich practical experience. The internal stress caused by flame is the same as that caused by welding. If the internal stress produced by improper correction is superposed with welding internal stress and load stress, the longitudinal stress of column, beam and brace will exceed the allowable stress, which will lead to the reduction of bearing safety factor. Therefore, we must be careful in the steel structure manufacturing, try to use reasonable process measures to reduce deformation, and try to use mechanical correction.