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Causes of porosity at the weld seam of spiral welded steel pipe

2021/04/14

Causes of porosity at the weld seam of spiral welded steel pipe

Many workers involved in processing steel pipes have reported the occurrence of porosity at the butt welds of spiral welded pipes. Spiral welded pipes are manufactured by rolling strip steel on a forming machine to create a helical shape, followed by double-sided submerged arc welding. During the production process, common defects such as incomplete penetration and edge misalignment often arise. However, among these issues, porosity at the butt welds is particularly difficult to control. Porosity refers to the presence, either on the weld surface or within the weld metal, of partially fused particles or gas bubbles, as well as sand‑like pits on the weld surface.

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What aspects should be paid attention to in the production of precision spiral welded pipes?

2021/04/12

What aspects should be paid attention to in the production of precision spiral welded pipes?

In general, the tools used in the production of cold-drawn precision spiral-welded pipes must have a surface finish better than Ra 0.4, dimensional accuracy at least to H3 grade, and a hardness exceeding HRC 70. Additionally, during the drawing process, neither the die tip nor the die itself should exhibit steel sticking.

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Will restoring spiral steel pipe affect its performance?

2021/04/08

Will restoring spiral steel pipe affect its performance?

In practice, it is often the case that, although a worn spiral steel pipe has been repaired and restored to its original dimensions, shape, and fit, the equipment still fails to achieve its original technical performance after assembly. This is typically due to deformation of the components—particularly of the base parts—which compromises the positional accuracy between the spiral steel pipes and disrupts the interrelationships among the constituent elements. Deformation of mechanical parts or assemblies can be classified into two types: elastic deformation and plastic deformation.

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How should spiral steel pipes be stored in summer?

2021/03/25

How should spiral steel pipes be stored in summer?

During the sweltering summer months, spiral steel pipes must be stored according to specific guidelines. As spiral steel pipes naturally absorb heat, improper storage that results in excessive heat release can lead to heatstroke among personnel in the warehouse or storage facility; therefore, this issue warrants careful attention.

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How can the service life of spiral welded steel pipes be extended?

2021/03/16

How can the service life of spiral welded steel pipes be extended?

Spiral steel pipes are primarily used for water supply, heating, pile foundation projects, and more. Since long-distance pipeline transportation typically involves a long-term investment, project owners seek to extend the service life of these pipelines and ensure they remain in perfect condition throughout the contract period. So, how can the service life of spiral steel pipes be improved? The following sections provide a detailed analysis.

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Spiral pipe manufacturer: How can the magnetic properties of thick-walled spiral pipes be addressed?

2021/03/05

Spiral pipe manufacturer: How can the magnetic properties of thick-walled spiral pipes be addressed?

Thick-walled spiral tubes typically exhibit either non-magnetic or weakly magnetic properties; however, even when magnetic, this does not significantly affect their performance during use. Therefore, for many manufacturers, eliminating magnetism in thick-walled spiral tubes remains highly necessary.

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How is hot-rolled spiral steel pipe inspected before leaving the factory?

2021/02/24

How is hot-rolled spiral steel pipe inspected before leaving the factory?

After spiral steel pipes are manufactured, it is essential to give full consideration to issues such as delivery, dispatch, and inspection. Compared with the actual production phase, these aspects may seem minor at first glance, yet they play a crucial role and should by no means be overlooked. Consequently, contracts must always be signed upon delivery of spiral steel pipes, which helps ensure the quality of this pipeline material. In fact, many of the advantages of this type of piping material are most clearly reflected in this stage.

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What are the common lengths of spiral welded steel pipes?

2021/02/20

What are the common lengths of spiral welded steel pipes?

Spiral steel pipes typically come in a standard length of 12 meters. In most applications, the quantity of spiral steel pipe is calculated based on this 12-meter length. Pipe specifications are indicated by the nominal diameter in millimeters; note that the nominal diameter may differ from the actual dimension. According to standards, there are two types of wall thickness: standard‑wall and thickened‑wall pipes.

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