There are many measures to prevent welding deformation of welded pipes. Due to the welding deformation of welded pipes is inevitable in welding production. In order to achieve the purpose of controlling the amount of deformation, one or more methods should be selected in production according to the specific type of welding structure.

Surface roughness refers to the small spacing and small peak-to-valley unevenness on the surface of the processed seamless steel pipe.

Submerged arc welding is a welding method in which an arc burns under a layer of flux. Submerged arc welded pipe mainly includes straight seam submerged arc welded pipe (LSAW) and spiral submerged arc welded pipe (SSAW)

Polyurethane insulation pipe has excellent characteristics such as light bulk density, high strength, heat insulation, sound insulation, flame retardant, cold resistance, anti-corrosion, non-absorbent, simple and quick construction, etc.

Galvanized pipe, also known as galvanized steel pipe, is divided into two types: hot-dip galvanized and cold-dip galvanized pipe. Hot-dip galvanized galvanized layer is thick, and has the advantages of uniform coating, strong adhesion and long service life. The cost of cold-dip galvanized pipe is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipe.

Pores in welded seam of welded steel pipe not only affect the tightness of pipe weld and cause pipe leakage, but also become the induction point of corrosion, which seriously reduces the strength and toughness of weld.