It's different. Interns from all over the country engage in different metalworking practices according to different majors, which are basically divided into lathe, milling, locksmith, numerical control, casting and welding, etc. Metalworking, referred to as metalworking for short, is a process technology that processes metal materials into articles, parts and components, including large parts such as bridges and ships, and even small parts such as engines, jewelry and watches.