There are setting machines and two-way welding, both of which need 320V electricity. While the iron is hot, the molding machine will have a line. A * * is two wires, one connected to a stick. You have to touch the ground to pull out the molding of the side of the car, and directly grind off the paint inside the car to expose the problem of the tin car. Ask the car master. 4S shop professional technician, 10 minutes to solve.