Verfahren zum Bearbeiten von Werkstücken mit Laserstrahlung

Process for the machining of workpieces by means of laser radiation, in which the machining process, in particular the weld-in depth or the degree of through-welding are monitored by detecting optical and/or acoustic signals resulting from a non-blocking, laser-induced plasma or vapour. In order to obtain monitoring results which are as independent as possible from signal fluctuations, the process subjects the signals to a frequency analysis in such a way that the average amplitudes of two different frequency bands of the analyzed frequencies are used together with a predetermined calculation function to determine an evaluation parameter.