During the construction process, various measures are taken to prevent welding deformation of spring supports and hangers, which can be summarized as the main deformation method, rigid fixation method, reasonable welding methods and specifications, and selection of reasonable welding sequence assembly, etc.
1. Deformation law:
The reverse deformation method is used to determine the size and direction of welding deformation before welding. The components after welding meet the design requirements. If the clamp is used to apply the welding deformation force method, the welding deformation is offset to achieve the purpose of preventing deformation.
2. Rigid fixation method:
The so-called rigid fixation method does not deform under the condition of increasing the rigidity of the weldment and fixing the components to reduce welding deformation. According to the opposite direction of deformation, the welded parts are repaired by a clamp or spot welding method, thereby limiting welding deformation. When welding fixed members set on the platform or equipment, the overlapping components increase rigidity, and then welding, heating and cooling shrinkage deformation, etc. The welding is subjected to external force by the fixed clamp, but this method is only suitable for low-carbon structural steel and low-alloy structural steel with better plastic, and is not suitable for medium-carbon steel and steel with worse weldability, because the welding pressure often makes welding cracks.
3. Choose reasonable welding methods and specifications:
From the factors that affect welding deformation, we can know that choosing low welding line energy welding methods and specification parameters can effectively prevent welding deformation, such as using carbon dioxide welding instead of manual arc welding, and the welding method adopts lower welding parameters to reduce energy.
Choose a reasonable welding sequence assembly
4. This method is to make the object in the welding process, through a reasonable assembly welding sequence, welding deformation can offset each other, so as to achieve the purpose of reducing deformation.
It can be used as I-beam welding, welding, and then according to welding can reduce welding deformation.
Correction method, after welding, the deformed welding assembly is bent and twisted beyond the current specifications and design requirements, and the spring hanger needs to be correct. The distillation methods are: mechanical correction method, flame heating correction method and mixed correction method. During construction, it can be reasonably selected according to the actual situation.
