Laser plastic welding for your material processing - Evosys Laser GmbH

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Principle of Laser Plastic Welding

safe - flexible - fast - precise

Laser plastic welding has established itself as a particularly precise and hygienic process among other joining methods and offers a variety of methods for online-process-monitoring to ensure the quality (Our partner for automated optical inspection technology: Intego GmbH).

In laser plastic welding (also called laser transmission welding), an upper part that is transparent for the laser wavelength is combined with an absorbing lower part. The laser beam is focused through the laser-transparent part onto the absorbing joining partner, causing it to melt on the surface. By applying a joining pressure to the component halves to be welded, a material-to-material bond is created.

Depending on the relative movement between the laser beam and the joining partner and the type of energy input, laser welding of plastics is divided into different process variants. On these pages we present the most common ones. A very often used variant is contour welding.

In contour welding, the weld seam is traced once or even several times with the laser. The plastic is only melted at the point of direct laser action and then immediately solidifies again so that there is no melt expulsion as shown in the animation above. The process can also be used for components with large dimensions.

The main applications for the laser welding of plastics can be found in the automotive, medical technology, pharmaceuticals and consumer products.