1.Welding machine 2.Used for metal welding 3.High working rate 4.High quality parts 5.Convenient ... and save labour YP-D21 20Khz Ultrasonic Metal Welding Machine By using the ultrasonic high frequeccy vibration principle, the ultrasonic ... and tolls, automobile and motorcycle, machine tools, hardware parts and machine parts, hardware mold, etc.4.Welding/Brazing:It mainly aims to melt ...