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Proceedings Paper

Real-time actuating of laser power and scanning velocity for thermal regulation during laser hardening
Author(s): F. Bataille; Didier Kechemair; R. Houdjal
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Paper Abstract

Real-time control during multikilowatt CO2 laser surface treatments is required to improve reproductibility, to simplify applications to complex geometry workpieces, and to deal with every kind of unsteady situation. A strategy involving automatics was chosen using linearization around some working points to solve nonlinear problems. Surface temperature was measured by a scanning pyrometer and a real-time temperature calculation allowed estimation of maximum temperatures at the chosen treatment depth. In a second step, maximum temperatures both at the surface and in the volume could be regulated simultaneously by actuating the laser power and the scanning velocity. Applications to laser self-quenching are detailed. The experimental setup and the complete closed-loop automatic system are described. The experimental results of the closed-loop system are displayed. Improvements of the regularity of the treatments are developed for complex geometry pieces. Another regulator was considered to ensure temperature cycles for 10 X 10 X 1 mm3 samples at a standstill in controlled atmosphere chamber during titanium nitriding.

Paper Details

Date Published: 1 October 1991
PDF: 5 pages
Proc. SPIE 1502, Industrial and Scientific Uses of High-Power Lasers, (1 October 1991); doi: 10.1117/12.46890
Show Author Affiliations
F. Bataille, Bertin et Cie (France)
Didier Kechemair, ETCA/CNRS (France)
R. Houdjal, ETCA/CNRS (France)

Published in SPIE Proceedings Vol. 1502:
Industrial and Scientific Uses of High-Power Lasers
Jean Pierre Billon; Edouard Fabre, Editor(s)

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