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Diode Lasers For Durable Joining Of Thermoplastic Polymers

Supplier: Raymax Lasers

Low and medium power diode lasers are superbly suited for high-quality and durable joining of thermoplastic polymers,based on transmission welding.


In transmission welding, the laser radiates through a laser-transparent joining partner and is absorbed by a non-transparent one. The absorbed energy plasticizes the material,and pressure and heat conductivity enable the components to form a joint.

The stability of the weld resulting from this is typically in the range of that of the base material.

A variety of color combinations

Laser welding is used, for instance, to make pressure-tight weld seams in vessels, electronic housings, automotive components, piping fittings or foils.

Optimized material and pigment selection ensures that a multitude of color combinations can be processed. Requirements regarding an absolutely tight weld seam and insensitivity towards shock are met to the same extent, as deviations in temperature do not play a role any more.

Even high strength materials containing more than 40 percent of glass fiber are no challenge.

Top six

  • Quasi-simultaneous or contour welding
  • High process stability
  • Low thermal and mechanical load
  • Welding with base material strength
  • Flexible, non-contact process
  • Soft energy coupling due to "top hat" beam profile

In industrial volume manufacture, reliability, profitability and simple operation of a tool are taken for granted to the same extent as its technical suitability. These requirements are fully met by the compact, fiber-coupled diode laser module.

Various special optics and additional components, such as a pyrometer for temperature-controlled welding or a CCD camera for process visualization can be added as modules.

For quasi-simultaneous welding, scan systems guide the laser focus along any 2D contour based on DXF data from standard drawing programs by highly dynamic deflection mirrors.

Very Compact = High Flexibility

In welding of plastics, diode lasers have already come to stand for a proven and well-established technology. Their intriguing profitability is based on their flexibility, their high efficiency and their simple integration into production facilities.

Welding Of Plastics

Welding of plastics by diode laser supplements traditional welding procedures, such as ultrasonic, vibration or heat plate welding. It combines the advantages of non-contact welding, without forming fluff or excess melting, with the possibility of a measurable setting path.

Laser welding is unique in allowing for high freedom of design in the development of new components and housings. Laser technology facilitates non-contact welding at low thermal and mechanical load.

This is especially advantageous to plastic housings with inbuilt electronic components that may be damaged in conventional procedures, such as vibration welding or ultrasonic welding.

Low Thermal Load

Compared with conventional solid state lasers, the diode laser has an advantage in its wavelength spectrum and its "top hat" beam profile without intensity peak. This avoids local temperature peaks that might damage the welded components.