Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip steel that is welded after being crimped and formed, and is generally 6 meters in length. Welded steel pipe production process is simple, high production efficiency, many varieties and specifications, less equipment investment, but the general strength is lower than seamless steel pipe. Welded steel pipes are divided into straight seam welded pipes(
ERW pipe,
LSAW pipe) and spiral welded pipes (
SSAW pipe)in the form of welds.
Production Process
Straight seam welded pipe production process is simple, high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It is possible to use narrow blanks to produce welded pipes with larger diameters. It is also possible to produce welded pipes with different diameters from blanks of the same width. But compared with the straight pipe of the same length, the length of the weld is increased by 30-100%, and the production speed is lower.
Welded pipes with large or thick diameters are generally made directly from steel blanks, while thin-walled welded pipes with small welded pipes need only be directly welded through steel strips. Then, after simple polishing, brushing is sufficient.
Supplement: Welded pipe is welded with strip steel, so in its original position it is not as high as a seamless pipe.
Welded pipe process
Unwinding of raw materials—leveling—cutting and welding at the end—looper—forming—welding—removal of internal and external weld beads—pre-correction—induction heat treatment—sizing and straightening—eddy current testing—cutting—hydraulic inspection—pickling—final inspection (Strictly check)—packaging—shipping.
Characteristics
Straight seam welded pipe production process is simple, high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It is possible to use narrow blanks to produce welded pipes with larger diameters. It is also possible to use the same width of blanks to produce welded pipes with different pipe diameters. But compared with the straight pipe of the same length, the length of the weld is increased by 30-100%, and the production speed is lower.
Application range
The products are widely used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, and are one of the 20 key products developed in my country.
For liquid transportation: water supply and drainage.
For gas transportation: coal gas, steam, liquefied petroleum gas.
For structural use: for piling pipes and bridges; for pier, road, building structure, etc.
