Straight seam steel pipe does not refer to a certain type of steel pipe, but a large category of welded pipes. It is made of steel strips. Steel pipes made using straight seam high-frequency welding equipment can be called straight seam steel pipes. Simply speaking, When welding steel plates, the steel pipes whose welds are on the same straight line can be called straight seam steel pipes.
According to different uses and subsequent production processes, they can be roughly divided into scaffolding pipes, fluid pipes, wire casings, support pipes, and guardrail pipes. Low-pressure fluid welded pipes are a type of straight seam welded pipes. After welding, another step is required for water and gas transportation. A water pressure test, so the price of low-pressure fluid pipes is usually higher than ordinary longitudinal welded pipes, such as 1-inch (DN25) (ie 33.5 * 3.25) welded steel pipe fluid. Welded steel pipes are also called welded pipes. After bending, they are made of steel plates or Steel strip welding and can be divided into straight seam welded pipes and spiral welded pipes according to the weld form. According to the application, it can be divided into ordinary welded pipes, galvanized welded pipes and oxygen-blown welded pipes, wire casings, transformer pipes, thin-walled pipe welding, and special-shaped pipes. Fusion and spiral welded pipe.
General welded pipe: This kind of welded pipe is mainly used to transport low-pressure liquid or fluid. Of course, in addition to these types of steel, some easy-to-weld steels can be used to make general welded pipes. There are some requirements for surface quality. This kind of steel pipe must go through Water pressure, bending, flattening, and other tests.
Double-sided submerged arc straight seam steel pipes are also straight seam steel pipes. The submerged arc welded steel pipes use the JCOE cold forming process, the welding seam uses welding wire, and the submerged arc welding uses granular flux. The main production process of the submerged arc welded straight seam steel pipes is flexible and can Produce any specifications with a wall thickness of 325~1420 mm, which can meet customers' requirements for steel pipe size. Domestic standard production usually uses high-frequency straight seam steel pipes. High-frequency straight seam steel pipes are often called raw steel pipes. The name of this industry is different from that of submerged arc. Welded straight seam steel pipe or thermal expansion high-frequency straight seam steel pipe, their names are often confused.
Things to note when using straight seam steel pipes:
The installation and use of straight-seam steel pipes have strict process requirements and need to be carried out according to the actual situation and operating procedures to ensure quality. Construction preparations before the use of straight seam steel pipes. To excavate the pipe trench and complete the pipe well masonry, straight seams need to be installed. Installation of steel pipes can begin only after the equipment, including welding machines, cutting machines, electric hammers, and polishing machines, is ready.
For the installation of straight seam steel pipes, the pipes are designed and positioned according to the drawings, the pipe racks are prefabricated according to the on-site conditions, and then the materials are cut according to the design and on-site, and the grooves are polished with a polishing machine and then welded together.
Quality requirements for use: Branch pipes should not be welded at the welds, and welds on elbows should be avoided. The deviation per meter for vertical installation should be less than 3 mm, and the deviation per meter for horizontal installation should be less than 1 mm. The weld should be straight and full. There is no burn-through or crack on the weld surface.
