Mr. H. Dieter Mokler Profile

H. Dieter Mokler

Managing Director at Precitec Optronik GmbH

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Proceedings Article | 7 September 1994 Paper

On-line Nd:YAG laser welding process monitoring

Marius Jurca, Dieter Mokler, Radu Ruican, Thomas Zeller

Proceedings Volume 2207, (1994) https://doi.org/10.1117/12.184742

KEYWORDS: Signal processing, Plasma, Sensors, Laser processing, Signal detection, Laser welding, Nd:YAG lasers, Metals, Optical filters, Head

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The here presented monitoring method is based on the UV-light detection being emitted by the welding plasma plume and the measurement of the near-IR radiation of the glowing spatters which are thrown out of the welding pool. The results of the above mentioned spatter detection are used to approximate the size of the occurred holes in the weld. A third sensor is used for monitoring the workpiece temperature. This additional signal is very important when welding thin metal sheets (e.g. overlap welds). Further the implementation of the presented monitoring method in an industrial instrument is described. This instrument is a self-learning real-time monitoring system which needs several teach welds for creating a position-true reference. In the following automatic mode it compares the most important features of the actual weld with those of the learned reference. Using fuzzy-logic routines the probability is determined that a metallographically important welding failure has happened. The LWM 900 has been developed initially for monitoring the CO₂-welding process. The Nd-YAG laser welding process differs slightly from it. This fact has to be considered accordingly for a proper signal detection. Additionally, due to the fact that most of the used detectors are sensitive to the wavelength of the Nd-YAG laser, some measures have to be considered to reject unwanted influences in this connection.

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