If it is the exterior decoration of the car body, it will generally not have much impact. If it is the main load-bearing part of the car, it will have a certain impact. After the bottom big edge sheet metal is repaired, the exterior looks the same, but the internal galvanized antirust layer has lost its antirust effect after high temperature.

The biggest influence is the low edge. After repair, the exterior looks like it will return to its original appearance, but the internal galvanized antirust layer has lost its antirust effect after high temperature. If the air is humid in rainy season, it will corrode from the inside out. If you have just finished repairing, I suggest you buy a bottle of wax and inject it into the cavity and spray it evenly into the process hole at the bottom of the big blade to prevent rust.

Material requirements:

1, the sheet metal material must have good plasticity. Must have the ability to produce permanent deformation under the action of external force without being destroyed. For cold-worked parts, good cold plasticity is required, such as stamping parts of automobile parts; For hot working parts, good thermoplasticity is required, such as hot forgings, spring steel plates, hot rivets, etc.

2. Good weldability. Many automobile sheet metal parts are welded together by spot welding, oxygen welding, arc welding or gas shielded welding, so it is required that the sheet metal parts must have good welding performance. This is especially important in automobile maintenance and repair. Materials with good weldability have high welding strength and low cracking tendency.

3. Low price, economy and practicality. For any part of an automobile, the economy should be considered under the condition of meeting the working conditions. You can use ferrous metals instead of nonferrous metals; If you can use non-ferrous metals, never use precious metals. The service life of automotive sheet metal parts should be compatible with the service life of other automobile parts.