Sheet metal is a comprehensive cold working process for sheet metal (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.

Interpretation of Modern Chinese Dictionary (5th Edition): Verbs, processing metal plates such as steel plates, aluminum plates and copper plates.

To put it bluntly, sheet metal is a kind of automobile repair technology, that is to say, the deformed part of the automobile metal shell is repaired, for example, the car body shell is hit by a pit, and it can be restored to its original state through sheet metal.

Sheet metal apprentices are naturally apprentices who study sheet metal technology.