1. Derusting penetrates the box body, but pay attention to the exposed pipeline of the door when disassembling, and properly cooperate with the angle grinder to remove some rusty parts.

2. Cut the area iron plate with tin sheet, shape it to be consistent with the rusty part, and reserve a certain size for punching.

3. After completion, punch holes in the parts and nail rivets.

4. Use sandpaper to handle the corner burrs at the repaired parts of the box body, brush the primer, brush the primer on the brush and the box body after drying, and brush the paint with the same or almost the same color as the box body after drying.