Repair techniques for automotive sheet metal parts

The techniques for repairing bent automotive sheet metal parts are applied when a car is subjected to external forces such as compression or impact, resulting in significant damage to the affected area. Accurate measurement of deformation area and damage data is required through observation or professional detection tools. During the repair process, the main method used is the support method, which repairs the damaged area by utilizing the reverse force of the support direction to correct the bending of the car's body sheet metal. However, during the use of this method, attention should be paid to the application of gap pads to reduce damage to the car body caused by repair actions.

For tearing repairs on automotive sheet metal parts, most situations may result in misalignment of sheet materials, and in severe cases, it may lead to material loss. The repair process involves two steps: first correcting and then welding. The correction step is a preliminary treatment for damaged areas of automotive sheet metal parts, followed by using oxy-welding techniques to complete the repair. However, during this process, using modern welding equipment like CO2 gas welding can make the weld interface at the damaged area smoother.

If there are ductile protrusions at the weld joint, a new type of concave-convex damage repair method should be used to fix it. In cases of severe tearing damage, repairs can be completed by excavating or replacing new components.

The wrinkling repair for automotive sheet metal parts mainly addresses areas with elastic or plastic deformation damage through wrinkling or concave-convex damage repairs. Identifying how wrinkling damage manifests in automotive sheet metal parts is fundamental for selecting appropriate repair methods. For concave-convex damage, modern equipment like body repair jigs can be used along with hammering or pulling methods for repairs. A common approach for minor concave-convex injuries is to use a wedge at the lowest point on the reverse side and hammer multiple times for repair; whereas for severe concave-convex injuries, support pads are placed behind concave areas to restore them through pushing and pulling. Since this restoration requires considerable supporting force, preheating of dented areas can be done while monitoring popping effects and analyzing rebound phenomena to ensure complete restoration of concave-convex damages. For wrinkled damages, further expansion of wrinkled areas in automotive sheet metal parts is achieved through opposing external forces, transforming wrinkled damages into concave-convex damages before applying corresponding jig fire reduction methods for repairs.