Nowadays, technology is highly advanced, and this is evident in the welding field, where numerous methods exist. Besides traditional welding techniques, several innovative methods have emerged and are playing a significant role in various production sectors. Surfacing welding is one such advanced repair welding technique.
Hardfacing is a welding process that involves depositing a layer of metal with properties like wear resistance, corrosion resistance, and heat resistance on the surface or edges of a workpiece. Hardfacing offers significant economic benefits by extending the service life of parts, utilizing materials efficiently, improving product performance, and reducing costs. Different workpieces and hardfacing rods require different hardfacing techniques to achieve satisfactory results. Issues encountered during hardfacing often include cracking, which can be prevented primarily through pre-weld heating, controlling interlayer temperatures, and slow cooling post-weld. Stress-relieving heat treatment is performed after welding. Avoid multi-layer hardfacing and use low-hydrogen hardfacing rods. If necessary, a transition layer between the hardfacing and the base material should be applied using rods with low carbon equivalent and high toughness.
In the field of industrial production, there is a high technical demand for surfacing and the operators. In actual operation, not only must cracking be avoided, but the hardness, strength, and surface smoothness of the surfacing workpieces must also meet national standards. This necessitates that companies possess excellent surfacing equipment to ensure the quality of the welding to the maximum extent.