1. Do mild steel pipe welds need anti-corrosion?

During the welding process of mild steel pipes, the welds often become the most vulnerable part of the entire pipeline system. Due to the high temperature during welding, the metal structure in the weld area will change, which may lead to coarse grains, uneven structure and other problems, thereby reducing the corrosion resistance of the area. Therefore, it is necessary to carry out anti-corrosion treatment for mild steel pipe welds exposed to corrosive environments.

Anti-corrosion treatment can effectively protect the welds from erosion by corrosive media and extend the service life of the pipeline. Commonly used anti-corrosion methods include coating anti-corrosion coatings, electrochemical protection, etc. These methods can form a protective layer on the weld surface to isolate the contact between the corrosive medium and the weld metal, thereby achieving the purpose of anti-corrosion.

2. Do mild steel pipe welds need pickling?

Pickling is a commonly used metal surface treatment process designed to remove oxides, rust and other contaminants on the metal surface to expose a clean metal surface. For mild steel pipe welds, pickling can remove oxides and impurities generated during welding, which helps to improve the corrosion resistance of the welds.

However, whether it is necessary to pickle the welds of mild steel pipes depends on the specific situation. If effective protection measures have been taken during the welding process to ensure the cleanliness of the weld area, then pickling may not be necessary. On the contrary, if there are obvious oxides and contaminants on the weld surface, then pickling will be necessary.

3. Do pipeline welds still need anti-corrosion after pickling?

Although pickling can remove contaminants on the weld surface and improve its corrosion resistance, it does not mean that the welds after pickling do not need to be treated with anti-corrosion. In fact, the surface of the weld after pickling is more likely to react with oxygen to generate new oxides. Therefore, in order to protect the welds after pickling from erosion by corrosive media, corresponding anti-corrosion treatment is still required.

When choosing an anti-corrosion method, factors such as the characteristics of the target environment, the use requirements of the pipeline system, and cost should be considered. For example, in a highly corrosive environment, a more durable anti-corrosion coating or electrochemical protection method may be required.

Conclusion

In summary, the welds of mild steel pipes do need to be treated with anti-corrosion treatment to ensure their corrosion resistance. Pickling treatment can be used as a means to improve the corrosion resistance of welds, but it does not mean that anti-corrosion treatment can be omitted after pickling. In practical applications, appropriate anti-corrosion methods and measures should be selected according to specific circumstances to ensure the safe and stable operation of the pipeline system.