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Proceedings Paper

Toward real-time control of surface treatments with liquid phase: molten depth on-line estimation
Author(s): Hugues Derouet; Georges Caillibotte; Didier Kechemair
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Paper Abstract

This article deals with on-line control of laser melting including laser beam control. A control induces some advantages which are an improved quality of the treatment and more regular results, with the object to industrialize the process. The studied application is laser remelting of cast iron. The laser is a UTIL CW CO2 of 22 kW maximum power. The process which is developed to improve proprieties is described, the physical process is modelled and the experimental setup is depicted. The commands (mainly: sample velocity, laser power and intensity distribution) and the outputs (molten depth) are chosen in accordance with the application under consideration. Internal closed loop control is formulated and used to regulate incident laser power. Different sensors have been experimented such as C.C.D. camera. Disturbances in the molten zone have been experimentally observed. The average molten depth has been considered as the first output to regulate. It is estimated from molten pool dimensions measured by the CCD camera and image on-line processing. This process is modelled from two command variables, then internal parameters are identified and finally the molten depth control on-line could be obtained.

Paper Details

Date Published: 7 September 1994
PDF: 9 pages
Proc. SPIE 2207, Laser Materials Processing: Industrial and Microelectronics Applications, (7 September 1994); doi: 10.1117/12.184739
Show Author Affiliations
Hugues Derouet, Unite mixte ETCA/CNRS (France)
Georges Caillibotte, Unite mixte ETCA/CNRS (France)
Didier Kechemair, Unite mixte ETCA/CNRS (France)


Published in SPIE Proceedings Vol. 2207:
Laser Materials Processing: Industrial and Microelectronics Applications

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