Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Process control during laser machining

 
: Drenker, A.; Gatzweiler, W.; Wissenbach, K.; Beyer, E.

Quenzer, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High power CO2 laser systems and applications
Bellingham/Wash.: SPIE, 1989 (SPIE Proceedings Series 1020)
ISBN: 0-8194-0055-6
S.149ff.
European Congress on Optics (ECO) <1, 1988, Hamburg>
Englisch
Konferenzbeitrag
Fraunhofer ILT ()
controller; identification algorithm; laser-induced plasma; laser machining; process control; pyrometer

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.

: http://publica.fraunhofer.de/dokumente/PX-29420.html