Surface hardening processes include ion implantation and diffusion surface treatment processes such as (carburizing, nitriding or Kolsterising®) and localized or induction surface treatment. Surface hardening processes are well suited for improving the wear resistance and corrosion resistance of selected areas of machines, such as the cutting edges of earth-moving machinery. Hardfacing is a coating or deposition process that can also produce hard or hardenable surface layers by welding materials with different properties to a substrate.