... 20KHZ, 28KHZ, 35KHZ, 40KHZ Ultrasound technology in industrial applications are the followings: welding, heeling-in, forming, riveting, spot welding, ... Frequency stabilization, the frequency shows by itself in the productive process, observation conveniently.2, Strong ... and fundamental part of ultrasonic equipment, in production technology, product technology, quality assurance, etc. has very stringent ...