What Does Hardfacing Mean?
Hardfacing refers to a coating technique that involves welding a more corrosion and wear resistant material onto the surface of a less durable metal. The process may be performed prior to the use of the substrate metal or periodically as maintenance.
Hardfacing is also known as hardsurfacing.
Corrosionpedia Explains Hardfacing
Hardfacing is generally performed using three different techniques:
- Thermal spraying involves the application of a protective coating of a thickness less than or equal to 0.3 mm. It involves minimal thermal temperature variations.
- Spray fusing involves applying self-fluxing overlay coatings. It makes use of the Ni-Cr-B-Si-C alloy system and can be applied across a wide range of temperatures.
- Weld hardfacing involves the application of a protective coating of a thickness greater than 1 mm. It involves dense layers and high bond strength.