Thermal damage, absorbent particles or defects in the weld seam: there are a number of things to consider when laser welding components. One way to ensure consistent quality of the weld seams is to use the EvoInspect Vision from Evosys Laser GmbH. Non-destructive testing is possible using (near) infrared, reflected and transmitted light and the associated software.

Using infrared, the EvoInspect Vision system makes defects visible that cannot be seen with the human eye.

Laser plastic welding is ideal if plastic parts need to be connected to one another steadily and reliably. The process is particularly impressive due to its high precision and flexibility. Areas of application include in particular the automotive industry, medical technology and pharmaceutical industries as well as the consumer sector.
In order to guarantee the high quality of the products to be welded, one crucial aspect is that the laser-transmissive joining partner must have sufficient transparency in the wavelength range used. In addition, it is important to be able to identify thermal damage, constrictions and interruptions in the seam when analyzing the weld seam quality afterwards.
This can be done using micrographs or microscope images of mechanically broken components, for example. However, this method involves complex mechanical and destructive processing of the component.

Furthermore, defects in the laser-transmissive joining partner can negatively influence the welding process or make it impossible. Defects that can occur are, for example, irregularities in the transmission of the laser-transmissive material, accumulations of glass fibers or impurities such as absorbent particles. Another problem can be a varying surface finish. In this case, it is helpful to be able to recognize and sort out faulty joining partners before the welding process.

Together with Evosys Laser GmbH, Intego GmbH has developed a near-infrared-based system for non-destructive testing of the weld seams of laser-welded components and deviations in the transparency of laser-transmissive joining partners. The system can also visually inspect the insertion depths of cables in connectors, for example. This is particularly helpful for connectors that do not appear transparent in the visible wavelength range.

If you would like to find out more about our near-infrared system or have any questions, please contact us on +49 9131 40 88 0 or send an e-mail to

Our experts will answer all your questions and inform you whether this system can also be used in your case.