Laser welding is the use of high-energy laser pulses to locally heat the material in a small area. The energy of laser radiation is diffused into the material through thermal conduction, and the material is melted to form a specific molten pool. It is a new type of welding method. Laser welding is mainly used for welding thin-walled materials and precision parts. It can realize spot welding, butt welding, overlap welding, seal welding, etc.