Introduction of straight seam steel pipe and precautions for using straight seam steel pipe

Straight seam steel pipe does not refer to a certain type of steel pipe, but a large type of welded pipe. It is made of steel strip. The steel pipe made of straight seam high-frequency welding equipment can be called straight seam steel pipe. In fact, in simple terms, 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, it 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. A water pressure test, so the price of low-pressure fluid pipes is usually higher than that of ordinary longitudinal welded pipes, such as 1 inch (DN25) (ie 33.5 * 3.25) welded steel pipe fluid, welded steel pipe is also called welded pipe, after bending, use steel plate or Steel strip welding can be divided into straight seam welded pipe and spiral welded pipe according to the form of the weld. They can be divided into ordinary welded pipe, galvanized welded pipe and oxygen-blown welded pipe, electric wire bushing, transformer pipe, thin-walled pipe welding, and special-shaped pipe according to the application. Fusion and spiral welded pipes.

General-purpose welded pipe: This type of welded pipe is mainly used to transport low-pressure liquids or fluids. Of course, in addition to these types of steel, there are also some easily welded and welded steels that can be used to make general-purpose welded pipes. There are some requirements for surface quality. Water pressure, bending, flattening, and other tests.

Double-sided submerged arc straight seam steel pipe is also straight seam steel pipe, submerged arc welded steel pipe adopts JCOE cold forming process, welding wire adopts welding wire, and submerged arc welding adopts particle flux. The main production process of submerged arc welded straight seam steel pipe is flexible and can be Produced under any specification, wall thickness is 325~1420 mm, which can meet the customer's requirements for steel pipe size. Domestic standard production usually adopts high-frequency straight seam steel pipe, high-frequency straight seam steel pipe is usually called original steel pipe, the name of this industry is different from submerged arc Welded straight seam steel pipe or thermally expanded high-frequency straight seam steel pipe, their names are often confused.

Precautions in the use of straight seam steel pipes

The installation and use of straight seam steel pipes have strict technical requirements, which need to be carried out according to the actual situation and operating procedures to ensure quality. Before the use of straight seam steel pipes, the construction preparations to excavate pipe trenches and complete the masonry of pipe wells need to install straight seams Steel pipes, including welders, cutters, hammers, and polishers, are ready to start the installation.

For the installation of straight seam steel pipes, design and position the pipes according to the drawings, prefabricate the pipe racks according to the site conditions, and then cut the materials according to the design and site, grind the grooves with a polishing machine and then weld them together.

Use quality requirements: branch pipes should not be welded at the weld, avoid welding at elbows, the deviation per meter of vertical installation should be less than 3 mm, and the deviation per meter of horizontal installation should be less than 1 mm, the weld should be straight and plump, There is no burn-through and crack on the weld surface.