1. Anti-rust treatment should be done on the surface of galvanized pipe.
2. The welding port needs to be polished and smoothed, and then painted with anti-rust paint.
3. If the anti-rust layer of the welded joint is damaged during the welding and cutting process, and the anti-rust effect is not achieved, it is necessary to fill the unevenness of the welded joint with putty, and then apply the anti-rust paint.
