Laser cutting aims to convert laser emitted from the laser emitter into high-power-density laser beam through focusing. The laser beam irradiating the surface of work pieces make them reach the melting or boiling point. Meanwhile, high-pressure gas on the same axis with the beam will blow off melted or gasified metals. Accompanied by movement of beam in corresponding to relative position of work pieces, material will form a kerf eventually for the purpose of cutting.

Laser welding is an efficient precise welding method using high-energy-density laser beam as the heat source. Laser welding represents an important aspect for application of laser material processing technologies. During 1970s, it was mainly used for welding of thin-wall materials and low-speed welding. The welding process is of heat conduction type. In other words, surface of work pieces is heated by laser radiation, and surface heat diffuses internally through heat conduction.

By controlling such parameters as width, energy, peak power and repetitive frequency of laser pulse, work pieces are to be melted to form a specific bath. It has been successfully applied to precise welding of minor and small parts owing to its unique advantages.

Laser cladding is a new surface modification technology. It is expected to form a metallurgically bonded filler cladding by addition of cladding material on the substrate surface, and using high-energy-density laser beam for consolidation with substrate finish.

Laser additive reproduction is a technical behavior using laser cladding technologies for recovery of geometric and dynamic performance of expired and mis-processed parts. Many major equipments for modern industrial purpose and national defense are characterized by complicated techniques, prolonged processes and high expenses. When such equipments are in service, some critical parts may become invalid due to such reasons as wearing, corrosion, fatigue and accidents. This may affect normal operation of equipments. Repair and reproduction of such parts of high added value will be able to ensure normal operation of equipments, saving of expenses and creation of more economic benefits.