Welded pipe is divided into general use of welded pipe, galvanized pipe, oxygen pipe, wire casing, metric pipe, roller tube, deep well pump, automotive tube, transformer tube, welded thin-walled tube, welded pipe and spiral Welded pipe.
Welded steel pipe is bent with steel or steel plate is round, Welded Steel Pipes square and other shapes and then welded into the surface of the seam with the steel pipe. The billet used for the welded steel pipe is steel or strip.
The characteristics of welded steel pipe: in the steel pipe, straight seam welded pipe production process is simple, high production efficiency, low cost, rapid development. The strength of the welded steel pipe is usually higher than the straight seam welded pipe, with a relatively narrow blank production pipe diameter of the pipe, Welded Steel Pipes you can also use the same width of the blank production pipe diameter different pipe. However, compared with the same length of the straight pipe, the weld length has increased by 30% to 100%, Welded Steel Pipes and the production rate is relatively low. Therefore, the smaller diameter of the pipe is generally used straight seam welding, large diameter welded pipe are mostly used in the form of spiral welded pipe.
(SY5038-83), the main use of high-frequency lap welding method for the pressure of fluid transmission of the spiral seam height (high pressure welding), the use of high-frequency welding pipe, Frequency welded steel pipe. (SY5037-83), the use of double-sided automatic submerged arc welding or single-sided welding made of water for the water, the use of high-pressure, Gas, steam and other general low-pressure fluid transmission with submerged arc welded steel pipe.
Welded steel pipes are generally made of ordinary carbon steel. According to the wall thickness can be divided into two kinds of ordinary steel pipe and thickening. Welded Steel Pipes According to the surface of galvanized steel pipe is divided into galvanized steel pipe and galvanized steel pipe. Surface is not galvanized that ordinary welded steel pipe. Galvanized welded steel pipe, commonly used in the transmission medium requires a more clean pipe. Galvanized welded steel pipe for conveying steam, gas, compressed air and condensate.
Welded steel pipe in the factory at two points, Welded Steel Pipes one is the tube end with a thread. Pipe with threaded steel pipe, each pipe length of 4 ~ 9m, without thread welded steel pipe, each pipe length of 4 ~ 12m.
Welded steel pipe wall thickness by different, divided into thin-walled steel pipe, thickened steel pipe and ordinary steel pipe. Process pipeline is the largest amount of ordinary steel pipe, the test pressure of 2.0MPa. Thicker steel pipe test pressure of 3.0MPa.
Welded pipe connection method is more, there are threaded connection, Welded Steel Pipes flange connection and welding. Flange connection is divided into threaded flange connection and welding flange connection, welding method is divided into gas welding and arc welding.
Commonly used welded steel pipe nominal diameter of 6 ~ 150mm.