Advantages of Ultrasonic Welding

  • Much faster than conventional adhesives or solvents.
  • Drying time is very quick.
  • The pieces do not need to remain in a fixture for long periods of time waiting for the joint to dry or cure.
  • The welding can easily be automated, making clean and precise joints.
  • The site of the weld is very clean and rarely requires any touch-up work.
  • The low thermal impact on the materials involved enables a greater number of materials to be welded together



  • Flexible and versatile with little tooling changeover or fixture modifications, consistent and repeatable, very rapid weld time confined to the bonding or joint area, can replace fasteners and adhesives.
  • It has 16 weld programs which include parameters like Trigger pressure, Weld pressure, Amplitude etc.


Part design –Ultrasonic Weld Joint

  1. Energy director: Define a place to start the weld
  2. Sonotrode contact: Allow the ultrasound to have a direct path to the joining area
  3. Support: Allow the bottom weld-part to resist deformation
  4. Melt encapsulation: Prevent the melt from leaving the joint
  5. Centering: Ensure a consistent alignment
  6. Volume and part travel: Allow the part to move freely and the melt to go somewhere
  7. Prevent hard stop
  8. Let the part sink into the melt during holding
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Joint Designs

The most commonly utilized joint designs that AMTEC recommends

  • Step Joint
  • Step Joint (chisel)
  • Tongue and Groove Joint
  • Mash Joint

These designs all utilize the most important design rules. The use of each design is subject to the specific application and requirements of the weld.

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