20KHZ 7000W ultrasonic metal spot welder machine is equipped with a high-quality ultrasonic transducer, built-in electronic protection circuit, no need to frequently replace amplifiers due to step-less adjustment of amplitude, and is widely used in the metal products industry, such as ultrasonic welding for aluminum foil, an ultrasonic welder for 18650 battery, ultrasonic welding machine for copper tube, etc.