Laser welding is one of the important aspects of the application of laser material processing technology. The welding process belongs to heat conduction type, that is, laser radiation heating the surface of the workpiece, the surface heat diffuses to the interior through heat conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse, the workpiece melts and forms a specific melting. Pool. Because of its unique advantages, it has been successfully applied to the welding of micro and small parts.