Drilling is to drill a hole in a piece of wood or sheet metal by punching a bunch of two types. Bench to floor by objects that can pierce bolt to fix the two pieces together for cutting. Factory industry is divided into four types: 1 Plasm asc Oxyful Cutting 2 Oxyful cutting 3 laser cutting 4 waterjet Cutting Laser Cutting
and Welding. The process was used for the material. Most metals and plastics To gather together.Normally used to make pieces and add melted down in a pool of molten metal filling of molten material. When cooled, the joints will be strong. Sometimes the pressure with heat. Or alone To weld