Basic Requirements For Anti-corrosion Construction Of Welded Steel Pipes

At present, welded steel pipes are widely used. The following will introduce the basic requirements for the anti-corrosion construction of welded steel pipes.

1. Processed components and finished products shall be subject to surface treatment only after passing the inspection.

2. The burrs, electric welding coating, welding nodules, splashes, dust, and scale on the surface of welded steel pipes should be cleaned before de-rusting, and fluffy oxide scales and thick rust layers should be eradicated at the same time.

3. If there is oil and grease on the surface of the welded steel pipe, it should be cleaned before de-rusting. If there is only oil and grease on a certain area, you can usually use a local treatment method; if there is a large area or the entire area, you can use solvent or hot alkali for cleaning.

4. When there are acids, alkalis, and salts on the surface of welded steel pipes, hot water or steam can be used to wash them off. However, attention should be paid to the disposal of wastewater so as not to pollute the environment.

5. Some newly rolled stainless steel pipes are painted with maintenance paint in order to avoid corrosion during short-term storage and transportation. For stainless steel pipes coated with maintenance paint, it should be handled according to the specific situation. If the maintenance paint adopts a two-component coating cured by a curing agent, and the coating is basically intact, it can be treated with abrasive cloth, stainless steel tube velvet, or lightly sprayed, and after the dust is cleaned, the construction of the next process can be carried out.

6. For the maintenance coating of the welded steel pipe surface coated with shop primer or daily primer, the treatment method should be selected according to the current situation of the coating and the next matching paint. Those that cannot be further coated or affect the adhesion of the next coating should be completely removed.