Disadvantages are: 1, the welding quality is difficult to guarantee, and the welding quality of mandrel surfacing is greatly influenced by the technical level and experience of operators. If the operation is improper, welding defects such as blowholes and cracks are easy to appear.
2. The welding deformation is large, and the heat input of core rod surfacing is large, which is easy to cause welding deformation, especially for surfacing of large workpieces, and the deformation problem is more prominent.