Other main factors in sheet metal fabrication are welding. Once all the components are formed, they are then assembled into a welding position. Welding techniques can be used in sheet metal fabrication in order to prevent warping or any other problems. These techniques include covering the metal with sand during the cooling process Heat is applied to the metal in a slow manner to remove abnormalities. The metal is usually finished by being sandblasted, primed and painted. This ensures the metal looks fantastic and ready.