Nowadays, hot-dip galvanized steel pipes are a common type of fire pipes and play an irreplaceable role in the fire safety industry. Why can't hot-dip galvanized pipes be replaced by cheaper welded pipes or cold-dip galvanized pipes?

1. Judgment from the surface, that is, visual inspection. The appearance inspection of welded joints is a simple and widely used inspection method. It is an important part of finished product inspection. It mainly detects defects on the weld surface and dimensional deviations. Inspection is generally carried out through naked eye observation with the help of tools such as standard templates, gauges and magnifying glasses. If there are defects on the surface of the weld, there may be defects inside the weld.

Submerged arc welding technology is ideal for critical applications such as pipelines, pressure vessels, track manufacturing and primary structures. It has the simplest single-filament form, double-filament structure, tandem double-filament structure and multi-filament structure.

Straight seam steel pipes can be divided into high-frequency straight seam steel pipes and submerged arc welded straight seam steel pipes according to the production process. The following introduces the most common forming processes of high-frequency straight seam steel pipes and submerged arc welded straight seam steel pipes.

The high-frequency welded pipe forming roller is an important part of the welded pipe unit and the technical core of the welded pipe forming process.

Steel pipe piles have the advantages of light weight, good stiffness, strong bearing capacity, easy adjustment of pile length, less soil discharge, little impact on adjacent buildings, simple joint connections, reliable project quality, and fast construction speed.

With the continuous development of our country's economy and the vigorous development of the national energy industry, long-distance oil and gas pipelines are an important way to achieve energy security.

In the production of high-frequency welded pipes, the formation of the pipe blank and the state of the seam directly affect the quality of the weld, and the parallelism of the weld butt surfaces is particularly important. During the joint welding process of steel pipes, the parallelism of the joints is mainly ensured by adjusting the reduction of the upper roller of the extrusion roller and the gap between the two upper rollers.

Straight seam steel pipe is a type of welded steel pipe that is widely used in daily life. I believe many people who are in contact with pipeline engineering have heard of straight seam steel pipes. But do you all know the differences between different specifications of straight seam steel pipes? let's see!

In the general quality standards for welded structures, there is no clear limit on surface pitting of welds and is not used as a basis for product acceptance.