The general method of treating slight concave-convex injury is to put a cushion on the back depression and repair the injury with a hammer for many times. Restore support by placing a cushion on the concave back. Support recovery needs more support. You can heat the concave position in advance, observe the ejection result in time, analyze the rebound phenomenon, and completely recover the concave-convex damage. By resisting external force, the position of the fold in automotive sheet metal is further expanded, and the conversion between fold damage and concave-convex damage is realized, and the corresponding personalized repair method is adopted for repair.

The welding length of different positions is determined by carbon dioxide gas shielded welding, and the appropriate welding method is selected. When the welding is short, the welding can be started from the damaged outer side and gradually welded to the inner side. If the welding crack is long, it should be fixed by spot welding, and the welding temperature should be controlled to prevent the layout from being distorted. Double-sided welding technology can be selected to improve welding strength. If the crack has a back connection, the thick plate on the back can be heated first, and the welding and fusion of the thick plate can be completed from the outside. If there is a long weld outside the internal thick plate, the welds at both ends can be welded first.

It should mainly deal with the pruning operation after the repair is completed. You can use a hammer to lay an anvil with a suitable shape at the opposite position of the hammer and extend outward from the raised position to complete the plastic repair work. If there is a large concave area, the original shape can be further trimmed with a mallet, and finally repaired with a hammer. Correction and repair are mainly aimed at repairing the bending and stretching of some automobile fenders when the automobile is damaged by collision. Traction devices are usually used to fix the two ends and change and manipulate the length of the deformed part at the center.

The application of conservative methods mainly lies in restoring the original appearance. The main recovery stages can be summarized as determining the supplementary scope, replacing the processing template, positioning and welding the new plate, leveling and strengthening. Finally, the effective treatment of automobile body sheet metal is realized. The maintenance technology of automobile door is mainly the correction and maintenance when the door frame is distorted or deformed. For the repair of deformation or distortion damage of automobile door frames, the replacement and treatment of door panels are the main repair means, and the door panel repair method of Ambassador He Yuping is mainly used to deal with the common door panel damage of automobile body, and a single mobile grinder is used to complete the maintenance of main door panels.