Before painting, automotive parts should be stamped and welded. Before painting, it is necessary to check whether there are defects such as deformation, burr, welding slag, rust and so on. The rust and oxide scales on the surface of steel are generally brittle and loose substances, which are easy to absorb moisture and other contaminants. They must be removed to prevent corrosion from affecting the adhesion of coatings.

At the same time, coating management is an important condition to ensure the normal implementation of the determined process, to ensure the stability of coating quality, to achieve the goal of high quality coating and to achieve the best economic benefits. Coating management of motor painting line includes production management, process management, equipment management, safety and discipline management, quality management, site management, etc.

When the raw materials are changed, the quality should be confirmed with the material supplier and the main engine factory. The replacement can be applied only after the quality test and the small batch trial installation are qualified.