How is the gold thread welded on the LED?
Ultrasonic waves generated by both the source and the ultrasonic transducer (40~140KHz), the amplitude of energy in porcelain rod tip, wire (wire or wire) with high frequency vibration in the ceramic nozzle driven by the friction between the welding and metal surface, the surface oxide layer and crack, plastic deformation, ultimate metal a strong bond formed on the welding surface.
The machine used for surface welding of different media, is a physical process. The first end must first wire processed to form spherical (this machine adopts electronic negative pressure into the ball), and on the surface of metal welding to preheat treatment; then the gold ball joint action in time and pressure, plastic the deformation in the welding metal surface, the two types of media to achieve a reliable contact, and the friction between the two kinds of ultrasonic vibration, the metal atoms in atomic affinity formed under the action of metal bonding, welding wire bonding is realized. The welding wire ball welding is better than in the Ridong electrical properties and applications on silicon aluminum wire, but due to welding for the precious metal must be heated, the application scope is relatively narrow.
