Maintenance methods of welded steel pipe

A welded steel pipe is created by welding steel plates or strips that have been curled and formed into shape. This manufacturing process is relatively simple, offers high production efficiency, and results in a wide variety of pipe types and sizes. Additionally, the equipment investment for producing welded steel pipes is lower compared to seamless steel pipes. However, the overall strength of welded steel pipes is generally lower than that of seamless steel pipes.

As with any product, the longevity of welded steel pipes is closely tied to proper maintenance. To extend their service life, it's essential to follow regular maintenance practices. Below is a guide to maintaining welded steel pipes.

Cleaning and Grinding:
If the welded pipe is damaged, it’s important to polish the affected areas. Special attention should be given to scratches and splashes caused by contact with carbon steel parts, as well as damage from cutting slag. Thorough cleaning and polishing of these areas are essential.

Mechanical Polishing:
Use appropriate polishing tools and techniques to ensure a uniform finish. Avoid over-polishing, which can lead to re-scratching or damaging the surface.

Degreasing and Dust Removal:
Before the pickling and passivation processes, the welded pipe must be free of oil, scale, dust, and other debris. This step is crucial for ensuring that subsequent treatments are effective.

Water Sandblasting:
Depending on the specific processing requirements, select the appropriate micro glass beads and process parameters for water sandblasting. Care must be taken to avoid over-spraying, which can damage the pipe.

Pickling and Passivation:
The welded pipe should undergo pickling and passivation according to strict process requirements. This step helps in enhancing the corrosion resistance of the pipe.

Cleaning and Drying:
After pickling and passivation, it's important to neutralize, rinse, and dry the pipe according to the prescribed process to ensure that all residual acid is completely removed.

Protection:
Once the surface treatment is complete, the pipe should be protected from secondary contamination caused by handling, as well as exposure to oil, dust, and other debris.

By adhering to these maintenance practices, the service life of welded steel pipes can be significantly extended. Regular upkeep not only enhances the durability of the pipes but also improves their efficiency and safety in daily use. Therefore, it's important to remember and implement these maintenance steps routinely.