Welded steel pipe refers to the steel strip or steel plate bending deformation of the shape of the round, square and other welded into the surface, the seam of the steel pipe. According to different welding methods can be divided into arc welded pipe, high-frequency or low-frequency resistance welded pipe, Welded Steel Pipes gas welded pipe, furnace welded pipe, such as Bundy. According to the weld shape can be divided into straight seam welded pipe and spiral welded pipe.
Welded steel pipe is lower cost and higher production efficiency than seamless steel tube. The spiral welded pipe adopts the electric contact pressure gauge to control the pressure of the oil cylinder on both sides of the conveyor to ensure the smooth conveying of the strip. Welded Steel Pipes The use of external control or internal control roll molding.
Since the 1930s, due to the rapid development of high quality strip rolling and the progress of welding and inspection technology, the quality of weld has been progressing constantly, the type of welded steel pipe has been increasing, and more and more categories have replaced the seamless steel tube.
The characteristics of welded steel pipe are as follows: simple manufacturing process, many kinds of specifications, less investment in equipment.
Welded steel pipe is divided into straight seam welded pipe and spiral welded pipe.
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 welded steel pipe is usually higher than that of straight seam welded pipe, Welded Steel Pipes which can produce welded pipe with a large pipe diameter with narrow billet, and can produce pipe with different diameters with same width. However, compared with the equivalent length of the straight seam tube, the weld length increases the 30%~100%, Welded Steel Pipes and the welding pipe production speed is relatively low. Therefore, the smaller-caliber welded pipe generally uses straight seam welding, large-caliber welded pipe is mostly used in the form of spiral welded pipe.
It is mainly used for transporting oil and natural gas pipelines; high frequency welded steel pipe (sy5038-83) for pressurized fluid conveying, mainly welded by high-frequency lap welding, used for high frequency welded pipe of spiral seam for pressure fluid conveying. Steel pipe bearing capacity is strong, good plasticity, easy to weld and process molding; general low pressure fluid conveying spiral seam submerged arc welded steel pipe (sy5037-83), Welded Steel Pipes the use of double-sided automatic submerged arc welding or single-sided welding method for water, gas, air and steam, such as the general low-pressure fluid transport submerged arc welded steel pipe.