There are usually the following methods for sheet metal repair: (1) Sheet metal repair pull-ring traction repair method is a sheet metal repair method introduced in recent years. The so-called pull ring traction repair method is to weld a certain number of flat pad pull rings according to the size of the damaged parts of sheet metal parts. The flat pad pull ring is called the pulling medium. The steel wire is inserted into the medium, and then the steel wire is pulled manually or mechanically, so that the damaged part of the sheet metal part is pulled out by the medium. Can be restored to the original position and shape, especially suitable for large-area deformation, double-layer structure of sheet metal parts, parts that are not easy to close, corner transition, door posts and so on. It is more convenient to repair with pull ring traction method. (2) Thermal shrinkage method Local thermal shrinkage method is a common method for sheet metal repair. The damage deformation of sheet metal parts is mainly the tensile deformation of related parts. The original shape can be restored by eliminating the tensile stress by thermal shrinkage. (3) The hammer jacking method is a traditional sheet metal repair method. The sheet metal worker holds a hammer in one hand and a top iron or other tools in the other to tap and reshape the sheet metal. Manual operation of sheet metal requires the skills and experience of sheet metal workers, and good sheet metal repair technology cannot be obtained overnight. Sheet metal repair mainly includes deformation surface shaping and contour line correction.