The production of seamless steel pipes demands strict adherence to cavity cleanliness and dimensional tolerances for wall thickness. However, during the electric welding process, the molten metal material causes an increase in pipe thickness at the welding area, resulting in uneven surfaces on both the inside and outside. This unevenness leads to higher energy consumption during conveyor operations, necessitating the implementation of the internally welded floor leveling technique. Through this technique, specialized equipment is employed to conduct multiple cold rolling passes on the weld, thereby smoothing and eliminating any delamination on the internal and external welding surfaces. To correct such internal welding issues in steel pipes, dedicated equipment incorporating mandrels and rollers is utilized for reverse and reverse welding of the pipes.
The seamless splicing of seamless steel pipes is efficiently achieved by taking into consideration the overturning frequency and compressive strength. To understand the machine and equipment's technical characteristics, let's delve into the inner welding level's production process. As the internal welding precision leveling roller smoothly rolls out, the pipe section transforms into a horizontal ellipse, with the axle tightly fixed within the pipe, diligently following its trajectory. By utilizing the cylinder, the axle is effortlessly pulled back to its designated position, subsequently enabling the implementation of the secondary cold rolling circulation system. This systematic approach ensures continuous extrusion, gradually refining the tube's inner diameter, resulting in a progressively flawless and seamless appearance.
The internal welding correction technology used in seamless steel pipes offers several advantages. Firstly, it ensures that no chemical substances are left on the inner wall, thereby preventing the accumulation of liquid or corrosive chemicals caused by welding. This feature also makes the pipes easy to clean and prevents bacterial growth. Additionally, the inner cavity of these pipes exhibits excellent corrosion resistance.
In industries such as liquids and food, it is crucial that the inside of the pipes is parallel to avoid any blockage caused by the flowing liquid. Currently, this type of internal welding straightening technology is applicable for pipes with diameters ranging from 12 to 219.
It is worth noting that seamless steel pipes of the same specification and model are equipped with a set of leveling rollers and vertical roller mold shells. However, for pipes with the same specification and model but different wall thicknesses, different journals are used.