What is Hardfacing

Surfacing refers to a process of stacking materials with certain properties on the surface of Weldments by welding. The purpose is not to connect the weldment, but to obtain the deposited metal layer with special properties such as wear resistance, heat resistance and corrosion resistance on the surface of the weldment, or to restore or increase the size of the weldment. Surfacing method is widely used in manufacturing and repair.

Generally speaking, the surfacing metal should first meet the service conditions of the weldment; Secondly, the weldability of the surfacing metal is better, and then the more economical surfacing metal is appropriately selected. The surfacing metals used under common working conditions are: hypoeutectic cobalt based alloy and cobalt based alloy containing intermetallic compound are selected for high stress intermetallic wear; Low alloy steel for surfacing welding shall be selected for low stress intermetallic wear; Most cobalt base alloys or nickel base alloys are selected for intermetallic wear + corrosion or oxidation; High alloy cast iron is selected for low stress abrasive wear, impact etching and abrasive etching; Low stress, serious abrasive wear, carbide cutting edge; Cobalt based alloy is selected for cavitation etching; High alloy manganese steel is selected for severe impact; Hypoeutectic cobalt base alloy is selected for severe impact + corrosion + oxidation; Hypoeutectic cobalt base alloy and cobalt base alloy containing intermetallic compound are selected for intermetallic wear at high temperature; Austenitic manganese steel is selected for chiseling abrasive wear; Thermal stability high temperature creep strength (540 ℃) cobalt base alloy carbide cobalt base alloy is selected. Iron based surfacing metal has many products, wide range of performance changes, good combination of toughness and wear resistance. Its biggest advantage is low cost, so it is widely used.