During the processing, the deformation of the workpiece is minimal, making it suitable for surface strengthening of certain workpieces or local parts that cannot be completed or difficult to achieve by other quenching techniques. Laser heat treatment has a high degree of automation, and the depth and area of the hardening layer are controllable. This technology is mainly used to strengthen the surface of automotive components or molds, improve their surface hardness, wear resistance, corrosion resistance, strength, and high-temperature performance, such as laser heat treatment of automotive engine cylinder holes, crankshafts, stamping molds, casting plates, etc.