Automobile sheet metal is also called cold work. Automobile sheet metal is equal to automobile sheet metal repair. It is the repair of the car body after a collision. To put it more directly, it is called butt welding repair and secondary manufacturing assembly. Collision vehicle repair is not just about knocking and knocking, the effect of repair cannot be said to be visible to the naked eye. Special tools and vehicle body data are also needed to determine the repair status of the vehicle body. Maintenance personnel must not only understand the technical parameters and dimensions of the vehicle body, but also the material characteristics, stress characteristics, deformation trends and stress points of the vehicle body, as well as the vehicle body technology and welding. Process, etc. Automobile sheet metal now has aluminum parts, so this kind of auto parts requires higher craftsmanship for repairmen, because aluminum parts require more complex equipment. For example, if there is a concave part on the aluminum part, then we do it as usual Maybe there is no way to do this work, so we can only restore the original shape by heating. The heating of aluminum is different from the heating of iron. Aluminum has been widely used in automobiles. Only by understanding its characteristics and density can we Fix it faster and better.