Subscribe to our newsletter to receive the latest news and events from TWI:

Subscribe >
Skip to content

In ultrasonic welding, which factors affect the weldability of thermoplastics?


Frequently Asked Questions

There are a number of factors that affect the weldability of thermoplastics in the context of ultrasonic welding. The main ones are:

  • Polymer structure, i.e. is it amorphous or semi-crystalline?
  • Polymer chemistry
  • Melting point
  • Melt flow rate

Other factors that may influence weldability include:

  • Fillers
  • Moisture
  • Additives
  • Mould release agents

Further information

See further information about plastics welding and testingor please contact us.

For more information please email: