Laser welding uses high-energy laser pulses to locally heat the material in a tiny area. The energy of the laser radiation diffuses into the material through heat conduction, melting the material to form a specific molten pool. It is a new type of welding method. It is mainly used for the welding of thin-walled materials and precision parts. It can realize spot welding, butt welding, overlap welding and sealing welding. It has a high aspect ratio, a small weld width, and a small heat affected zone. The deformation is small, the welding speed is fast, the weld seam is smooth and beautiful, and no treatment or simple treatment is needed after welding. The welding seam has high quality, no porosity, can be accurately controlled, and the focused spot is small, positioning accuracy is high, and automation is easy.