In most cases, when a car is involved in a collision accident, the surface covering of the body will deform or be directly damaged. If it is damaged, such as a torn bumper, it must be replaced. In some cases, only deformation has occurred, and this deformation is not significant, so there are two options for repair methods: reshaping or replacement. Everyone knows that after replacing the parts, they are no longer the original parts, and the quality is definitely not better than the original parts. If they are not replaced, they will only be reshaped and painted. Car owners are also concerned about strength and durability issues, so it is difficult to choose the repair method. Today, let's talk about under what circumstances do we need to replace parts? Under what circumstances only maintenance is sufficient.

   All parts that can be replaced separately are generally better than repaired. For parts that cannot be replaced separately, whether replacement is necessary depends on the degree of deformation and whether it can be repaired. It is best not to replace them easily. What are individually replaceable accessories? It is not integrated with the vehicle body and is installed on the body. It is a separately replaceable accessory. The most frequent accident replacements include front and rear bumpers, front fenders, doors, engine hood, water tank, and so on.

   On the contrary, as the body of the vehicle is a whole, it is a component that cannot be replaced separately. To replace it, the entire body of the vehicle must be replaced, which is obviously not replaceable. The repair method is cutting and welding. If there is severe deformation in this area, cut it off and then cut a piece from the same part of the new car body to weld onto the accident vehicle. There are many damages caused by accidents, such as rear fenders, lower door sills, B-pillars, and door frames. These areas have deformed. If replacement is needed, it is recommended to cut off the deformed areas and then weld the same areas from the new car body. The newly cut body is not a complete body, but a complete side of the body, which is very long and large from front to back, including all the aforementioned areas, where cutting is needed.

From the maintenance methods, we can see that the cutting and welding method is harmful to the vehicle. After welding, it is no longer an integral structure with the original vehicle, and the strength of the vehicle body will definitely decrease. So if these areas are injured and the deformation is minor, try not to replace them as much as possible. Plastic surgery and spray painting are sufficient. If the deformation area is relatively large, the depth is deep, or from a technical perspective it is already irreparable, then it must be replaced. Because the deformation is too large, even if it is reshaped, the strength here will decrease due to a large bending of the metal, which may not be comparable to the new one.

Components that can be replaced separately are not harmful to the car, and can be replaced regardless of the size of the damage. But the premise is to replace the original parts, and the quality of the auxiliary parts cannot be guaranteed. So if it's insurance or the other party's responsibility, it's best to go to a 4S store for repairs, as at least they are all original parts. Strictly speaking, a damaged component that can be replaced separately is not considered an accident vehicle, as the safety and other performance of the vehicle have not been affected. Only parts that are damaged and cannot be replaced separately are considered accident vehicles, regardless of the size of the damage.

       What is the method of sheet metal repair? By tapping, pulling, and polishing, for areas with significant deformation, use a hammer to strike first. For minor deformations, use pulling again, and for minor unevenness and burrs, use polishing again. Finally, spray paint and apply putty before painting. If too much putty is applied, the strength here will be poor. If there is a slight collision, the putty will crack and the paint surface will burst. So shaping is the key. If the shaping is done well, the putty can be applied thinner. One more thing that everyone should understand is that even if the exterior parts are replaced with new ones, the 4S store will spray paint them themselves, and the original parts sent by the manufacturer are unpainted. But new parts do not require putty for painting, they already have a good flatness, just spray them directly.

From: WONDEE Autoparts

2024-1-3