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What is the maximum frequency used in ultrasonic welding in Hz?
It is fast, economical, easily automated, and well suited for mass production, with production rates up to 60 parts per minute being possible. 
Ultrasonic welding uses ultrasonic energy at high frequencies (20–40 kHz, 20khz 4000w ultrasonic welding machine) to produce low amplitude (1–25 μm) mechanical vibrations.