... certificated 3. Exprienced welding workers 4. Automative welding design ALUMINIUM WELDING We are specialists in the welding processes of aluminium. ... chip formatting, rolling, stamping, deep drawing, bending, spot or seam welding, spinning, forging, sand casting, die casting, investment casting ... Rainbow Metalwork Co.,Ltd is expert in aluminium welding. We have professional team design and make ...