The surface of metals is always damaged by many factors, The laser cladding process allows for property improvements for the surface of a part, including wear resistance, as well as allowing for the repair of damaged or worn surfaces.
Laser cladding is a process in which a metal coating is applied onto the surface of a part using a laser as the heat source. The process is often used to create a protective coating for increased functionality, as well as restore damaged or worn surfaces. Laser cladding allows extended life of equipment and machinery in which parts are exposed to corrosion, wear or impact.
The precise nature of the process allows the quality of the coating to be accurately controlled. The key to successful laser cladding is controlling the heat input into the base material, which can be minimized whilst maintaining a high strength metallurgical bond.
The very fast cooling rate associated with laser cladding has the effect of producing fine high strength microstructures with minimal effect on the mechanical properties of the base material.
Laser cladding may be applied either in the original fabrication process of a part or later on in the context of refurbishing or repair. Examples for repaired objects are turbine blades, gear wheels and cutting tools. types of laser cladding
• Wire Feed Laser Cladding: In this way, a drum is used to expose the coating material in the form of wire to the laser. (Picture 1)
• Pre-Placed Powder Laser Cladding: In this method, the substrate material is covered with coating powder and then exposed to the laser beam. (Picture 2)
• Powder Injection Laser cladding: This process involves injecting the metal powder through a co-axial nozzle and then a laser beam is used to melt the coating material. (Picture 3)