Plastic Welding

Laser Plastic Welding Concept:
In laser welding of thermoplastics, sometimes referred to as “laser transmission welding” or IR welding, transparent and absorbing plastic parts are bonded together. The laser beam penetrates the transparent plastic and is converted to heat in the absorbing plastic. Since both parts are pressed together during the welding process, heat is conducted from the absorbing to the transparent plastic, allowing both materials to melt and create a bond. Internal joining pressure is also generated through the local warming and thermal expansion. The internal and external joining pressures ensure strong penetration welding of both parts.

Suitable Plastic Welding Materials:
Nearly all thermoplastics and thermoplastic elastomers can be welded with laser radiation – e.g. ABS, PA, PC, PP, PMMA, PS, PBT – even those reinforced with glass fibers. The welding seam strength is comparable with that of the base material.

Major Advantages

  • Non-contact, flexible joining technique
  • Minimal thermal stress on the welded parts
  • Simple joining seam geometry
  • No particulate development
  • Vibration-free processing
  • Optically perfect welding seam
  • High precision
  • High strength
  • Gas-tight, hermetic seals
  • No tool wear
  • No consumables (adhesive, fasteners, etc.)


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