Generally, the metal conduit welded with the anchor plate is permanently connected with the anchor plate by welding process. This kind of conduit usually adopts galvanized pipe or welded pipe. Galvanized pipe is a kind of hot-dip galvanized steel pipe, which can provide good corrosion resistance and prevent the pipeline from rusting in use. Welded pipe is made of steel plate rolling, welding and steel pipe treatment, which has high strength and stiffness.