24 March 1989 Process Control During Laser Machining
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Proceedings Volume 1020, High Power CO2 Laser Systems and Applications; (1989) https://doi.org/10.1117/12.950059
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany
Abstract
Controlled laser processing is required to improve and ensure the quality of welding and heat treatment. A sensor collects informations from the processing zone and passes them to a controller. The controller generates a signal adjusting the beam power according to the present situation. This feed-back structure using a pyrometer as sensor for the surface temperature was successfully employed for transformation hardening of workpieces with complex geometries. The complex phenomena in laser induced plasma require a modified sensor. The plasma signal detected by a photodiode contains implicit informations about the quality of the welding process. These informations have to be worked up before they can be passed to a controller. An experimental approach of process modelling, which requires a wide banded (0..300kHz) on-line mesurement of beam power for a recursive system identification algorithm, will be described.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Drenker, A. Drenker, W. Gatzweiler, W. Gatzweiler, K. Wissenbach, K. Wissenbach, E. Beyer, E. Beyer, } "Process Control During Laser Machining", Proc. SPIE 1020, High Power CO2 Laser Systems and Applications, (24 March 1989); doi: 10.1117/12.950059; https://doi.org/10.1117/12.950059
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