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Spiral Steel Pipe Production Process and Welding Technology

2022/05/09

Spiral Steel Pipe Production Process and Welding Technology

Spiral welded steel pipe is manufactured from strip steel or coiled sheet through a cold-forming process, featuring a helical weld. It is suitable for pressures up to 25 kg. For pipelines operating at pressures exceeding 25 kg, seamless steel pipes or straight-seam submerged-arc welded steel pipes are typically used.

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Straight-seam welded pipe manufacturer’s guide: Key considerations when selecting welded pipes.

2022/05/05

Straight-seam welded pipe manufacturer’s guide: Key considerations when selecting welded pipes.

What are the key challenges to consider when purchasing large-diameter welded pipes, as explained by manufacturers of straight-seam welded pipes? First, pay attention to wall thickness—pipes with a diameter exceeding 0.02 meters should have sufficient thickness to withstand the operating pressure; even under tensile stress, they should not easily crack. Second, inspect the surface finish: counterfeit large‑diameter welded pipes often exhibit surface blemishes or, in some cases, fine cracks, and their surfaces lack luster. If you spot such a pipe, you can be sure it is not a high‑quality seamless product.

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What is the welding process for straight-seam pipes?

2022/04/27

What is the welding process for straight-seam pipes?

The temperature of welded straight-seam pipes is primarily influenced by the high-frequency eddy-current heating power. According to Equation (2), this heating power is mainly governed by the current frequency, with the eddy-current heating power being proportional to the square of the excitation frequency. The excitation frequency, in turn, depends on the excitation voltage, the current, and the values of the capacitor and inductor.

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What are the applications of straight-seam pipes?

2022/03/28

What are the applications of straight-seam pipes?

A straight-seam pipe is a steel pipe whose weld seam runs perpendicular to and parallel with the pipe’s longitudinal axis. It is commonly referred to as a straight-welded pipe or a straight-seam steel pipe. Such pipes are manufactured by rolling a longitudinally cut steel strip of specified dimensions into a cylindrical shape and then joining the edges with a straight-seam weld using a high-frequency welding process. Pipe specifications are expressed in terms of nominal diameter, and they can be classified according to wall thickness into thin-walled and thick-walled types. Additionally, they may be categorized by cross-sectional shape into round, square, or specially shaped pipes.

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What are the classifications of straight-seam pipes?

2022/03/17

What are the classifications of straight-seam pipes?

Spiral-welded pipe: Generally has higher strength than straight-seam welded pipe. It can produce welded pipes with larger diameters using narrower blanks, and it can also manufacture welded pipes of varying diameters from blanks of the same width. However, compared with straight pipes of the same length, its weld length is 30%–100% longer, and its production speed is lower. Consequently, most small-diameter welded pipes are manufactured by straight-seam welding, while most large-diameter welded pipes are produced using spiral welding.

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What are the technical specifications of a straight-seam pipe?

2022/03/14

What are the technical specifications of a straight-seam pipe?

Straight-seam pipe is a type of welded steel pipe, referring to steel pipes whose weld seam runs perpendicular and parallel to the pipe’s longitudinal axis. Based on wall thickness, it is classified into thin-walled straight-seam pipes and thick-walled straight-seam pipes. According to its shape, it can be categorized into round pipes, square pipes, or specially shaped pipes. By application, it includes general welded pipes, galvanized pipes, oxygen‑service pipes, electrical conduit pipes, metric‑size pipes, roller‑track pipes, deep‑well pump pipes, automotive pipes, transformer pipes, film‑processing pipes, formed pipes, and spiral‑welded pipes.

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How to Select Spiral Pipes for Wastewater Treatment

2022/02/28

How to Select Spiral Pipes for Wastewater Treatment

The selection of spiral‑wound pipes should be guided by economic considerations. Higher‑grade steel pipes are slightly more expensive but can be made thinner; lower‑grade pipes are marginally cheaper but require thicker walls, so a cost‑benefit comparison is necessary. From the outlet to the inlet, varying wall thicknesses—two or three distinct grades—may be employed in response to pressure changes, with different wall thicknesses assigned to different pipe grades. For example, the outlet section might use a higher‑grade material, while the inlet section uses a lower‑grade material. Since piping costs account for roughly 25% of the total project investment, material selection must be carefully optimized.

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Causes of Certain Issues in Spiral Pipe Production

2022/02/11

Causes of Certain Issues in Spiral Pipe Production

What are the common causes of production problems in spiral pipes? During smelting or hot working, certain factors—such as non-metallic inclusions, gases, improper process selection, or incorrect operating procedures—can give rise to internal or surface defects in the steel. These defects severely compromise the quality of the material or finished product and may even result in scrap.

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