Laser welding control by monitoring of plasma

0424250 - FZÚ 2014 RIV US eng C - Conference Paper (international conference)
Chmelíčková, Hana - Šebestová, Hana - Havelková, Martina - Řiháková, Lenka - Nožka, Libor
Laser welding control by monitoring of plasma.
Optical Measurement Systems for Industrial Inspection VIII. Bellingham: SPIE, 2013 - (Lehmann, P.; Osten, W.; Albertazzi, A.), "87882P-1"-"87882P-8". Proceedings of SPIE, 8788. ISBN 978-0-8194-9604-1. ISSN 0277-786X.
[Optical Measurement Systems for Industrial Inspection /8./. Munich (DE), 13.05.2013-16.05.2013]
R&D Projects: GA TA ČR TA01010517
Institutional support: RVO:68378271
Keywords : laser welding * on-line monitoring * defect detection * parameters control * temperature distribution * confocal microscope
Subject RIV: JB - Sensors, Measurment, Regulation

Deep penetration welding is a typical industrial application of high power lasers, where plasma can be generated above the keyhole. Thanks to the plasma plume presence welding process can be controlled on-line by means of the plasma intensity measurements. Various on-line monitoring methods have been developed in research centers all over the world. Goal of them is to enable promptly operator action to avoid enormous economical looses if un-expected defect is detected. Our laboratory was participated in project CLET - "Closed loop control of the laser welding process through the measurement of plasma" as a responsible partner for developed system testing both in the laboratory with pulsed Nd:YAG laser and in the real welding facility with high power continual CO2 laser. Control system is based on the electron temperature computation from the relative intensities of couple of emission lines belong to certain metal ion present in plasma plume.
Permanent Link: http://hdl.handle.net/11104/0230283