1, repair is easy to rust and the surface putty powder will scrape very thick. In this case, the sheet metal is basically scraped with putty after repair.
2, artificial knock uneven, can only use putty leveling. That will be thicker, it will crack easily when it encounters temperature difference, and the door will open and close frequently, and it will crack easily when there is vibration.
3. What is new is that when it rains, the door often gets water, and the whole door will be electrolyzed by the setting machine, which will rot if it can't stand long-term corrosion.
Brief introduction of car door
A good door will have at least two anti-collision beams, and the weight of the anti-collision beams is heavier, which means that a good door is really biased. But you can't say that the heavier the door, the better. If the safety performance of modern cars can be guaranteed, designers will try their best to reduce the weight of vehicles, including doors (such as using new materials) to reduce power consumption. According to the number of doors, cars can be divided into two-door, three-door, four-door and five-door cars. There are four doors for official cars, four doors, three doors and five doors for family cars (the back door lifts the door), and two doors for sports cars.
design requirements
1, to ensure the convenience of passengers getting on and off, and the maximum opening is controlled at about 65 ~ 70;
2. When opening, it should not interfere with other parts;
3. The door should be locked reliably when it is closed, and it will not open itself when driving;
4. Reverse operation of door mechanism, including free door closing and easy glass lifting.
5, good sealing performance requirements;
6. It has a large transparent surface to meet the requirements of lateral vision;
7. It should have sufficient strength and rigidity to ensure the reliable operation of the door, reduce the vibration of the door part, improve the side collision safety of the vehicle and prevent the door from sinking;
8. Good door manufacturing and assembly technology.