In order to distinguish the quality of sheet metal parts, we can start with packaging, weight, welding process, painting process and the degree of coincidence when loading. It is very difficult for ordinary car owners to distinguish whether the sheet metal parts are of high quality after handing in the car, so they can distinguish them from the packaging of the products in advance: the products produced by small factories will not print the contact method and factory address, while the regular manufacturers will have steel stamps, qualifications and inspection labels on the products in addition to the contact method and factory address, even if consumers will use them in the future. Now, there is also a way to safeguard rights.

Accidental trauma repair is the main method to repair the impact damage of automobile stamping parts. The usual methods are shrinkage shaping, fold unfolding, stretching and pad prying reduction.

The quality inspection of automotive stamping parts needs to achieve: smooth surface, clear edges, enough rigidity and dimensional stability, and can not have wrinkles, scratches, brushing and other defects.