Metal plate, b?n?j?n (metal plate; SheetMetal in English), sheet metal has not been defined completely. According to a definition in foreign professional journals, it can be defined as: sheet metal is a comprehensive cold working process for metal plates (usually less than 6mm), including shearing, punching/cutting/compounding, folding, welding, riveting, splicing and forming (such as automobile body). Its remarkable feature is that the thickness of the same part is consistent. Automotive sheet metal [1]? (metal plate; It is a technical means of automobile maintenance. In this respect, automotive sheet metal is equal to automotive sheet metal's repair, which means that the car body should be repaired after the collision, that is, all the work except the anti-corrosion and decorative spraying of the car body. Such as body damage analysis, body measurement, body sheet metal shaping, stretching correction, stress relief welding, body accessories assembly adjustment, etc.