Closed-loop power and focus control of laser welding for full-penetration monitoring

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URI: http://hdl.handle.net/10902/822
ISSN: 1559-128X
ISSN: 2155-3165
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Autoría
Bardin, Fabrice; Cobo García, AdolfoAutoridad Unican; López Higuera, José MiguelAutoridad Unican; Collin, Olivier; Aubry, Pascal; Dubois, Thierry; Hötfström, Mats; Nylen, Per; Jonsson, Peter; Jones, Julian D.C.; Hand, Duncan P.
Fecha
2005-01-01
Derechos
© 2005 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/AO.44.000013. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Publicado en
Applied Optics, 2005, 44(1), 13-21
Editorial
Optical Society of America
Resumen/Abstract
We describe a closed-loop control system ensuring full penetration in welding by controlling the focus position and power of a 4-kW Nd:YAG laser. A focus position monitoring system was developed based on the chromatic aberration of the focusing optics. With the laser power control system we can determine the degree of penetration by analyzing the keyhole image intensity profile. We demonstrate performance in bead-on-plate welding of Inconel 718 and titanium. The focus control system maintained a focal position on tilted and nonflat workpieces, and the penetration monitoring technique successfully controlled the laser power to maintain the full-penetration regime in the presence of linear and step changes of thickness. Finally we discuss the performances and the limits of the systems when applied to a realistic complex aerospace component.
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