Welding of galvanized steel pipes is not allowed. Whether it is butt welding or casing welding, this is clearly stipulated in the acceptance specifications. Because welding will damage the galvanized layer, it is easy to recover from the anti-corrosion damage to the outer layer, but it will be difficult to restore the inner layer. Threaded connections should be used. But having said that, in fact, the galvanized quality of the galvanized steel pipes on the market now is very poor. If it is buried underground, even if it is not welded, it will be finished within a few years
Galvanized steel pipes for electrical use are generally Welding is not performed for the following reasons:
1. If galvanized steel pipes are welded, the galvanized layer outside the steel pipe will be destroyed and the corrosion of the steel pipe will be accelerated;
2. If welding is necessary When necessary, it is necessary to re-galvanize the welding joint or take other protective measures.