The machine is used to realize surface welding of different media, which is a physical change process. First, the head end of the gold wire must be processed into balls (this machine adopts negative electron high pressure ball forming), and the welding metal surface must be preheated first; Then, under the joint action of time and pressure, the gold ball produces plastic deformation on the metal welding surface, which makes the two media contact reliably. Through ultrasonic friction and vibration, under the action of atomic affinity, a metal bond is formed between two metal atoms, and gold wire leads are welded. Nidong gold wire ball welding is superior to silicon-aluminum wire welding in electrical performance and environmental application, but the application range is relatively narrow because the welded parts made of precious metals must be heated.