The production process of spiral steel pipes is simple, the production efficiency is high, and the welded pipe with a large production pipe diameter can also be used with different welding pipes with different billet production pipe diameters. However, compared with the same length of the same length, the length of the weld is increased by 30 ~ 100%, and the production speed is lower.
Most of the smaller -caliber welded pipes are welded with straight seams, and most of the large -caliber welded pipes are mostly spiral welded pipes. Spiral steel pipes: Spiral pipes are mainly used in tap water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction. They are one of the 20 key products developed by my country. For liquid transportation: water and drainage. For gas conveying: gas, vapor, liquefied petroleum gas. Structural use: pile tube, bridge; docks, roads, building structure pipes, etc.
The main production processes are as follows: Internal welding and external welding are welded with single -silk or dual -wire buried arcs to obtain stable welding specifications. Production workers adjust the process parameters at any time to eliminate defects in time. Cut the steel pipe into a single root with an air plasma cutting machine.
After cutting into a single steel pipe, each batch of steel tube heads must be strictly performed in the first inspection system to check the mechanical properties, chemical ingredients, dissolved conditions, the surface quality of the steel pipe, and the inspection of the steel pipes. Only in order to formally invest in production.
There is a part of continuous sound wave detection mark on the weld. After manual ultrasonic and X -ray reviews, if there are defects, after repair, it is not damaged until it is confirmed that the defect has been eliminated.
The tubes where the tube -shaped joints intersecting welded and intersecting the spiral weld are checked by X -ray TV or filming. Each steel pipe is tested by a static hydraulic pressure, and the pressure is sealing the pressure. The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device. The test parameter is automatically printed and recorded the mechanical processing of the end of the pipe to make the end surface vertically, and the horn angle and blunt side are accurately controlled.
