Principle of Ultrasonic Welding

Ultrasonic Equipment uses Ultrasonic Energy to perform various bonding & cutting functions such as resin welding, resin melt cutting, resin cutting, metal joining and food cutting. The basic components of Ultrasonic Welding Systems consist of an Ultrasonic Generator Unit and a Welder Main Unit (press).

Basic Configuration of Ultrasonic Welder and Role of Each Part

By applying ultrasonic vibration and force to the object to be joined, welding is achieved by utilizing the heat generated at the boundary surface of the objects.

Basic Configuration of Ultrasonic Equipment and Role of Each Part

  • Ultrasonic Generator: A commercial power line frequency (50/60 Hz) source is converted to high electrical frequencies of ultrasonic range or higher
  • Ultrasonic Transducer & Cone: Converts electrical frequency to a mechanical vibrational frequency and amplitude
  • Horn: Resonates with the vibration of the transducer, vibration, applies force to the objects to be joined, and directs energy to the area to be joined
  • Anvil (Support Jig): It is used to position and fix the object to be joined so that the vibration energy will not escape
  • Rib: It helps to direct and concentrate the energy at the joined section

Rib Shape and Knurling of Horn

It is common to provide ribs. In case ribs cannot be provided, such as the case of a thin material, knurling may be applied to the horn.

Rib Shape

(1) Standard Type

Most Frequently Used Model
Standard Type

(2) Step Joint

Positioning is Easy
Step Joint

(3) Share Joint

Air Tight Welding of POM, PP and PBT
Share Joint

(4) Tank Joint

Prevention from Extending Out of Burr
Tank Joint

Knurling of Horn

Knurling of Horn

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