Working principle of ultrasonic metal welding machine_technical requirements of ultrasonic metal welding machine
The ultrasonic metal welding machine was discovered by accident in the 1830s. At that time, during the current spot welding electrode plus ultrasonic vibration test, it was found that it could be welded without current, so the ultrasonic metal cold welding technology was developed. Although ultrasonic welding has been discovered earlier, its mechanism of action is not very clear so far. It is similar to friction welding, but there are differences. Ultrasonic welding has a short time and the temperature is lower than recrystallization; it is also different from pressure welding because the static pressure applied is much smaller than that of pressure welding. It is generally believed that in the initial stage of the ultrasonic welding process, tangential vibration removes oxides on the metal surface, and causes repeated micro-welding and destruction of the protruding parts of the rough surface to increase the contact area and increase the temperature of the welding zone. High, plastic deformation occurs at the interface of the weldment. In this way, under the action of contact pressure, when they approach each other to the distance at which atomic gravity can act, a solder joint is formed. The welding time is too long, or the ultrasonic amplitude is too large, which will reduce the welding strength or even destroy it.
