In the process of detecting damage of automobile sheet metal parts

2022-01-21 16:36:59

In terms of frame welding process, modern body repair generally adopts fusion welding, pressure welding and bonding, while electrode arc welding and oxygen acetylene gas welding, which were dominant in body repair in the past, should be carefully adopted in modern body repair.

 Welding rod arc welding is only used for the repair of frame body and low carbon steel body; Oxygen acetylene gas welding, pressure resistance welding and bonding are only used in some special processes. For the repair welding of new aluminum body, special welding process is needed. Different welding processes shall be adopted for body girders with different structures. When carrying out body sheet metal welding and maintenance, if you want to adopt a good welding method that will not reduce the original strength and durability of the body, you need to be familiar with the welding process adopted by each part of the original vehicle.

In the process of detecting the damage of automobile sheet metal parts, it is necessary to visually check the collision position, determine the collision direction and collision force, and check the possible damage. For the vehicle damaged in the accident, ask the speed of the vehicle and the position, direction and angle of collision or rollover at the time of the accident, understand the impact form, position and angle of the hit vehicle, and determine the position of collision damage and the area that may be affected in an intuitive way. The vehicle can also be comprehensively inspected in combination with test run and measuring instruments to confirm whether the underbody is deformed, whether the vehicle body is subject to overall damage and overall torsion, and whether the door can be opened freely, so as to determine the damage degree and repair method of the vehicle.

The vehicle after impact is not only the appearance damage, although the vehicle directly sees only the appearance damage after being impacted, and even the insurance loss determination often only evaluates the damaged parts.



Damage diagnosis is an important step in sheet metal maintenance. According to the basic steps of automobile damage diagnosis, each diagnosis and detection work needs to be done well in the following links.

To select proper sheet metal maintenance methods, it is necessary to understand the body manufacturing materials and frame welding process. The differences in body manufacturing materials and frame welding process between modern and traditional vehicles have led to changes in maintenance methods. For example, the traditional frame type car body is mainly made of low carbon steel or medium carbon steel. The pneumatic car body saw should be used when welding and cutting. If the traditional oxyacetylene cutting is used, it will cause great damage to the car body. Modern integral body frames are usually made of ultra-high strength steel (UHSS), high strength steel (HSS), high strength low alloy steel (HSLA) or alloy materials (such as aluminum alloy). Inert gas shielded welding or electronic spot welding must be used in the repair of structural parts. In addition, the change of steel plate thickness and the alloy composition of body materials will also be different in the selection of welding methods and relevant technical parameters, which requires familiarity with body materials for reasonable maintenance. After the car is damaged by collision, it must be corrected by omni-directional stretching, and the heating method shall not be used as far as possible, so as to prevent the internal structure of the metal from changing, resulting in the reduction of strength, so that the car can not effectively protect passengers in case of another collision.