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08-19-2010

Reflection diagnostics

Light as Quality Inspector

Reflection diagnostics

Faulty laser weldings on plastics can now be detected using a test method developed by LPKF Laser & Electronics AG from Erlangen, Germany. The patented method referred to as “reflection diagnostics” utilizes the physical effect of the reflection of light at interfaces.

In unwelded state, two interfaces exist between the joint partners. If light – including laser light – impinges on these interfaces, a certain proportion of the light is reflected. In welded state, one of the interfaces is missing and the measured reflection is lower. This allows the quality of the weld seam to be assessed using this inspection method even during the welding process.

This inspection method is particularly suitable for delicate components, such as automobile rear lights or solar panels. According to the company, a lower scrap rate is achieved in conjunction with a hybrid welding system (type: LQ-TwinWeld3D, same manufacturer) and the user receives meaningful quality documentation on each part. Reflection diagnostics supplements the existing quality assurance systems such as joining stroke monitoring, pyrometer monitoring or combustion detection with the aim of achieving continuous tracking and tracing. The method can be integrated into the welding systems as an option from this fall on.

Company profile

LPKF WeldingQuipment GmbH

Alfred-Nobel-Str. 55-57
DE 90765 Fürth
Tel.: 0911 66989-0

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