Spiral steel pipe is a low carbon carbon structural steel or low alloy structural steel steel strip rolled into a billet according to the angle of a certain spiral line (called the molding angle), and then made by welding the pipe seam, it can be made with a narrower strip to produce a large diameter steel pipe. Its specifications are expressed in terms of the outer diameter * wall thickness, welded pipe should ensure that the hydrostatic test, tensile strength of the weld and cold bending properties to comply with the provisions.

The basic principle is to install two fixed-length grating scales on the outside of the two ends of the straight seam steel pipe, the grating scales are driven by the rods near the ends of the steel pipe, and the length of the straight seam steel pipe is measured by the interference phenomenon of light. It is characterized by high accuracy. However, the scale is expensive and difficult to maintain, so it is sensitive to the effects of dust and site vibration.

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Spiral steel pipe production process is simple, high production efficiency, into the material to produce a larger diameter welded pipe, but also with the same width of the billet to produce a different diameter welded pipe. However, compared with the same length of straight seam pipe, the length of welded seam increases by 30~100%, and the production speed is lower.

The reason why LSAW steel pipe is widely used in the market is due to its own unique characteristics. The relatively low cost of the process used in the welding process and the fact that straight seam steel pipes can be manufactured using the fabrication processes of forging steel, extrusion, rolling and drawing steel, and that their specifications are relatively defined, offer the possibility of wide application.

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Underwater welding square tube, the equipment and power supply used should have good insulation and waterproof performance, its insulation resistance value shall not be less than 1MΩ, and should have anti-salt spray corrosion, atmospheric corrosion and seawater corrosion resistance.

By detailing the welding process and precautions for 304 stainless steel pipe, some key knowledge and guidance is provided. Material preparation Preparation: before the welding of 304 stainless steel pipe, it is necessary to carry out adequate material preparation. This includes cleaning the surface of the pipe to ensure that there is no grease, oxides and other dirt present.

Stainless steel welded pipe cleaning methods and precautions are described, including physical cleaning, chemical cleaning, mechanical cleaning of three aspects, and provide the relevant calculation formula and parameters.

LSAW steel pipe is a steel pipe made of hot-rolled or cold-rolled steel plate or steel strip coil welded on the welding equipment for straight seam welding to get the pipe are called LSAW pipe. LSAW steel pipe (YB242-63) is a steel pipe with weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer cooling oil pipe and so on.