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Proceedings Paper

Real-time focus controller for laser welding with fibre optic noninvasive capture of light
Author(s): Adolfo Cobo; F. Bardin; Duncan P. Hand; Julian D.C. Jones; O. Collin; P. Aubry; Thierry Dubois; M. Hoegstroem; P. Nylen; P. Jonsson; Jose Miguel Lopez-Higuera
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Paper Abstract

Laser welding is being introduced in the aerospace industry due to its many advantages over traditional techniques. However, welding of parts with complex shapes requires precise control of the focal point of the laser in order to achieve full penetration over the entire seam. In this paper, we present an improved control system for real-time adjustment of the correct focal position, which is based on the monitoring of the light emitted by the process in two different spectral bands. The reported system has been optimized for use in a real environment: it is robust, compact, easy to operate, able to adjust itself to different welding conditions, materials and laser setups, and includes a direct connection to an external PC. Results from recent field trials on complex aerospace structures are provided.

Paper Details

Date Published: 9 June 2004
PDF: 4 pages
Proc. SPIE 5502, Second European Workshop on Optical Fibre Sensors, (9 June 2004); doi: 10.1117/12.566709
Show Author Affiliations
Adolfo Cobo, Univ. de Cantabria (Spain)
F. Bardin, Heriot-Watt Univ. (United Kingdom)
Duncan P. Hand, Heriot-Watt Univ. (United Kingdom)
Julian D.C. Jones, Heriot-Watt Univ. (United Kingdom)
O. Collin, Snecma Motors (France)
P. Aubry, Cooperation Laser Franco-Allemande (France)
Thierry Dubois, Cooperation Laser Franco-Allemande (France)
M. Hoegstroem, Univ. of Trollhaettan/Uddevalla (Sweden)
P. Nylen, Univ. of Trollhaettan/Uddevalla (Sweden)
P. Jonsson, Volvo Aero (Sweden)
Jose Miguel Lopez-Higuera, Univ. de Cantabria (Spain)


Published in SPIE Proceedings Vol. 5502:
Second European Workshop on Optical Fibre Sensors
Jose Miguel Lopez-Higuera; Brian Culshaw, Editor(s)

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