It usually takes about two days to correct the girder. The Daliang school is slightly deformed, and it has little influence after modification. When the main girder is seriously deformed, the stiffness in the collision after repair is worse than that before repair. Girder plate is mainly used to manufacture automobile longitudinal beam, cross beam, front axle, bumper and other structural parts, and its thickness is generally 4.0-8.0 mm It is a steel type with large demand and high performance requirements among automobile structural steel plates. In order to improve the bearing capacity of automobile, prolong the service life of automobile and meet the requirements of energy saving, material saving and safe driving, it has become a development trend to produce automobile beam steel with low alloy high strength and ultra-high strength steel plates. Girders are generally rectangular or trapezoidal and are arranged at the bottom of the car body. The frame carries the whole car body, and the engine, suspension and car body are all mounted on the frame. The frame is provided with a screw hole for fixing the car body and a base for fixing the spring. Girders provide strong body rigidity and help to improve safety, which is very important for trucks and off-road vehicles. After modifying the girder, there is generally no big problem. 1. Body rectification refers to the process of restoring the parts damaged by accidents or fatigue to the "state" of the technical standards of the vehicle factory under the action of certain external forces. The word "country" has two meanings; 2. "State" refers to the relatively intuitive appearance and shape, and "State" is a more abstract and profound concept. For example, whether the internal molecular structure of metal is sorted in situ and whether the internal stress is completely released is directly related to the function and life of the vehicle after repair; 3. Structural parts refer to the components that mainly support and bear the body, and are the installation basis of body parts, which are commonly found in longitudinal beams, cross beams, doorposts and lower cross beams. This kind of components usually have very high strength, and most of them are closed box-shaped sections, so some measures need to be taken and reasonable technology should be adopted to repair them. Even if it is corrected, it cannot be corrected to the level of a new car. On the other hand, if the correction is not good, it will also lead to accelerated jitter of the car. The faster the jitter, the more serious it is. In addition, the vehicle's hunting will become obvious or serious. It is recommended to drive carefully after maintenance. Or exchange.