Toward real-time control of surface treatments with liquid phase: molten depth on-line estimation

Hugues Derouet; Georges Caillibotte; Didier Kechemair

doi:10.1117/12.184739

7 September 1994 Toward real-time control of surface treatments with liquid phase: molten depth on-line estimation

Hugues Derouet, Georges Caillibotte, Didier Kechemair

Author Affiliations +

Proceedings Volume 2207, Laser Materials Processing: Industrial and Microelectronics Applications; (1994) https://doi.org/10.1117/12.184739
Event: Europto High Power Lasers and Laser Applications V, 1994, Vienna, Austria

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.

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Hugues Derouet, Georges Caillibotte, and Didier Kechemair "Toward real-time control of surface treatments with liquid phase: molten depth on-line estimation", Proc. SPIE 2207, Laser Materials Processing: Industrial and Microelectronics Applications, (7 September 1994); https://doi.org/10.1117/12.184739

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