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