Laser processing refers to the use of laser beam to produce thermal effects on the surface of materials to complete the processing process, including laser cutting, laser engraving (laser marking), etc. Because the laser has four characteristics of high brightness, high directivity, high monochromaticity and high coherence, it brings some excellent characteristics that other ordinary processing methods do not have.

The conventional sheet metal processing technology is: cutting punching bending welding process or flame plasma cutting bending welding process. In the face of orders with multiple varieties, small batch, customization, high quality and short delivery time, it shows obvious inadaptability. Laser cutting technology, as an alternative technology of "cutting punching", has the characteristics of flexibility and high flexibility. At the same time, most people think its cost is high. Therefore, it is often used in the manufacturing of special-shaped (or complex shape) workpieces and samples (single piece or small batch). But when the small batch manufacturing is more and more popular and timely, the demand of laser cutting is also increasing.

The large number of fiber laser welding robots currently used in the automotive industry shows that the laser welding technology has matured. However, the laser welding technology is more complicated than the traditional welding technology, and the quality control link is different from the traditional welding quality control. Therefore, strengthening the quality control has important significance for the development of laser welding.