A: Hammer method: Use tools such as sheet metal hammer, jacking iron, leveling knife, etc. to force the protruding part to shrink and restore the deformation to its original state by knocking and squeezing.

Suction method: using sucker or pull rod to repair it into a small pit with large area depression damage or elastic deformation without disassembly. 、

Inertia hammer method: the impact force of inertia hammer is applied to the deformed part through the positioning device, so that the deformation and damage are repaired. Traction method: with the help of external traction, the deformation of skeleton, cross beam, fender, threshold and other parts or severely deformed parts can be corrected.

Support mode: the deformation of the frame-type member is pressed to the ideal position by the support force of the telescopic support rod. It is mainly used for extrusion deformation of open frame structure.