Effects of metal surface and beam shape on laser heat treatment using diode laser Available to Purchase

Laser heat treatment is one branch of laser surface modification processes. The results of laser heat treatment process are affected by properties of thermal conductivity, laser power density distribution, input heat energy, process speed, and shapes and surface condition of materials. Generally, conventional research on laser heat treatment process has been carried out on plain specimen by using the beam with uniform power distribution and heat input energy. This study focuses on the surface treatment of various metal surfaces and uses a two type beam shapes such as a line and rectangular of diode laser, which has relatively higher metallic absorptivity than CO₂ laser, as thermal source. Experimental setup was composed of 4 kW two types beam shapes such as a line and rectangular of diode laser. The objectives are to confirm the laser heat treatment characteristics by dominant process parameters and characteristics of melted and unmelted surface hardening, and finally to investigate the effects of metal surface of specimens, laser power, process speed and beam shape of heat source.