Laser heat treatment is a heat treatment that can perform heat treatment while minimizing the heat effect in the state of the completed finish machining of precision parts which is difficult to do with conventional surface heat treatment, thereby shortening post-process and reducing total costs through the minimization of deformation amount. Super-fast heating and self-cooling can form ultra-fine and full martensite, providing excellent wear resistance. In addition, it consumes less energy than conventional surface heat treatment and does not require a coolant, so it is an eco-friendly heat treatment suitable for carbon neutrality. Any area that can irradiate the laser beam can be heat-treated on products that were not possible in the existing heat treatment technologies, such as partial quenching of precision products or parts with complex shapes.

Laser heat treatment is a local heat treatment that can selectively harden only areas that receive a lot of load, and materials with a carbon content of 0.3% or more, such as carbon alloy steel and cast iron, are suitable for such treatment. For example, in the case of automobile press molds or injection molds, high heat is irradiated to areas that receive a lot of surface load, such as corners and edges, to transform the structure and increase the hardness. In general, case depth is less than 1mm, and the laser heat treatment can be applied to complex shapes or products such as various gears, shaft types, camshafts, cutting tools, and guide rails.

The figure below is an example of a product called taper cone, which requests that the taper surface be heat-treated. The dimensions were respectively measured after high-frequency heat treatment and laser heat treatment. As for the measurement method, the inner diameter size of circle 1 and circle 2 in the drawing was measured.