... ; Malleable iron; Tungsten steel, etc. 2. Machining processes: Metal fabrication, machining, welding, forming, shaping, punching, drilling, turning ... spot or seam welding, spinning, forging, sand casting, die casting, investment casting, etc. 3. Surface treatment: Polishing, zinc ... plating, decrement plating, etc. 4. Machinery and equipments: CNC machining center; CNC lathe; Normal lathe; CNC milling ...