Knowledge

13Mar, 2025

hydrostatic test
As a pressure-bearing pipe, spiral welded pipe must undergo a hydrostatic test as an essential process. Each steel pipe must be subjected to a hydrostatic test, with the test press
13Mar, 2025

Quality control in the production of spiral welded pipes
The production quality control of spiral welded pipes is a comprehensive and systematic process that covers various aspects from raw material selection, production process control
13Mar, 2025

Measures for addressing crack defects
Due to the significant impact of crack defects, it is necessary to devote more effort to inspecting for them. During the welding process, the first step is to select welding parame
13Mar, 2025

crack defect
Cracks are a common welding defect in threaded steel pipes, posing a significant impact on pipeline safety. They not only accelerate the corrosion rate of steel pipes but also carr
12Mar, 2025

Solutions to Incomplete Penetration and Lack of Fusion Defects
Incomplete penetration and lack of fusion defects are obviously closely related to the bevel dimensions. Therefore, in the design of bevels, it is essential to strictly adhere to t
12Mar, 2025

Incomplete penetration and lack of fusion defects
During the welding process, there is no tendency for some parts of the steel plate and the welding electrode to melt into each other, which can lead to incomplete penetration or la
12Mar, 2025

Solutions to Undercut Defects
The primary solution to undercut defects is to properly control the welding current, which can largely avoid the occurrence of undercut defects. By maintaining a stable arc length
12Mar, 2025

Causes of Undercut Defects
During the welding process, if a depression is formed at the edge of the weld, causing the weld seam to be lower than the base material, this depression is known as an undercut def
12Mar, 2025

Solutions to Slag Inclusion Defects
To improve the welding quality of spiral steel pipes and effectively address slag inclusion defects, it is essential to properly handle the bevel dimensions. Based on practical exp
11Mar, 2025

Cause of Slag Inclusion Defects
During the welding process, certain slag is generated from the welding electrode and steel plate, and some of this slag cannot be completely removed, resulting in some residue with
11Mar, 2025

Solutions to Porosity Defects
In order to better address the porosity defects in spiral steel pipe welding, it is necessary to treat the weld surface based on the understood principle of porosity formation, whi
11Mar, 2025

Cause of Porosity Defects
During the welding process of spiral steel pipes, gas spaces may exist on the surface of the weld or within the weld, and this defect is known as porosity. The main cause of porosi

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