When a car has an impact accident, in most cases, the body surface panel will be deformed or directly damaged. If it is damaged, such as a torn bumper, it must be replaced. In some cases, there is only deformation, and the deformation is not small, so the maintenance method will have two options, plastic or replacement. As we all know, after replacement, it's not the original car parts. The quality is certainly not as good as the original car parts. If we don't replace it, we only have plastic painting. The car owners are worried about the strength and durability, so they are very tangled in the choice of maintenance methods. Today, let's talk about how to replace it? Under any circumstances, only maintenance is OK.

For all parts that can be replaced separately, it is better to replace them than to repair them in most cases. For parts that cannot be replaced separately, whether they need to be replaced depends on the degree of deformation and whether they can be repaired. Do not replace them easily. What are the parts that can be replaced separately? It is not an integral part of the car body. It is installed on the car body and can be replaced separately. High frequency of accident replacement, front and rear bumper, front fender, door, hood, water tank and so on.

On the contrary, it is an integral part of the car body, that is, parts that cannot be replaced separately must be replaced by the whole car body. Obviously, it cannot be replaced. The repair method is cutting and welding. This place is seriously deformed. Cut off this seriously deformed place, and then cut a piece from the same part of the new car body to weld the accident car. Accident damage is more, the rear fender, under the threshold, B pillar, door frame. These places are deformed. If it needs to be replaced, it is necessary to cut the deformed places, and then cut the same places from the new car body and weld them. The cut new car body is not a whole car body, but a whole side of the car body, which is very long and big from front to back, including all the above-mentioned places, where it needs to be cut.

From the maintenance method, we can see that the cutting and welding method is to hurt the car. After welding, the car body is not an integral structure with the original car, and the strength of the car body must be reduced. Therefore, if these places are slightly deformed, even if it is the other party's responsibility and the other party pays for it, try not to replace them. Plastic surgery and spray painting are OK. If the deformation area is relatively large, the depth is relatively deep, or technically it is irreparable, it must be replaced. Because the deformation is too large, even if shaping, because the metal is subject to a large bending, the strength here is also reduced, which may not be comparable to the replacement.

Parts that can be replaced separately are harmless 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 accessory parts is not guaranteed. So if it's insurance or the other party's responsibility, repair the car or go to the 4S store, at least the parts are from the original factory. Strictly speaking, the damage of parts that can be replaced separately is not an accident car, because the safety and other performances of the car are not affected. Only damaged parts that cannot be replaced separately are considered accident vehicles, regardless of the size of the damage.

What is the repair method of accident sheet metal? By knocking, dragging and polishing, the places with large deformation are hammered first, then the small deformation is pulled, and the small unevenness and burr are polished. Then it's spray painting, and we need to apply putty before spray painting. If the putty hit more, the strength here will be very poor, a little collision, the putty will crack, the paint will burst. So shaping is the key, shaping the whole good, putty can play thin. One more thing you need to understand is that even if you replace the appearance parts with new ones, they are all self painted by the 4S shop. The original parts sent by the manufacturer are not painted. But the new part does not need to be puttied, it already has good flatness, so it can be sprayed directly.