Process control of laser keyhole welding

Fabrice Bardin, Adolfo Cobo, Jose M. Lopez-Higuera, Olivier Collin, Pascal Aubry, Thierry Dubois, Mats Högström, Per Nylen, Peter Jonsson, J. D C Jones, Duncan P. Hand

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)

Abstract

Online monitoring and control of laser keyhole welding is highly desirable, especially in safety-critical aeronautic applications, in order to detect and prevent possible defects in the weld. In this article we describe a closed-loop control system which ensures full penetration in keyhole welding by controlling the focus position and power of a 4 kW Nd:YAG laser. We present a laser power control system which determines the degree of penetration by analysis of an image of the welding keyhole. The focus position control system, meanwhile, is based on a previously reported system, exploiting the chromatic aberration of the focusing optics. We demonstrate performance in bead-on-plate 'welding' of Inconel 718 and Titanium. The focus control system maintained focal position on tilted and non-flat 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.

Original languageEnglish
Title of host publicationICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
Publication statusPublished - 2004
EventICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics - San Francisco, CA, United States
Duration: 4 Oct 20047 Oct 2004

Conference

ConferenceICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics
CountryUnited States
CitySan Francisco, CA
Period4/10/047/10/04

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    Bardin, F., Cobo, A., Lopez-Higuera, J. M., Collin, O., Aubry, P., Dubois, T., Högström, M., Nylen, P., Jonsson, P., Jones, J. D. C., & Hand, D. P. (2004). Process control of laser keyhole welding. In ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings