Real-time, nonintrusive oxidation detection system for the welding of reactive aerospace materials

M. D T Fox, Chris Peters, Ian Blewett, Duncan P. Hand, J. D C Jones

Research output: Contribution to journalArticle

Abstract

We describe the development of a real-time nonintrusive monitor to detect degradation of a gas shield condition during laser welding by use of on-axis spectrally resolved detection of light emitted from the workpiece. Failure of gas shielding to the point at which there is a risk of contamination from the air is revealed by the marked increase in the intensity of a spectral feature around 426 nm. To avoid unwanted sensitivity to the overall intensity of the radiation, the intensity at 426 nm is normalized by that at 835 nm, where the spectrum is insensitive to gas shielding. We collected the radiation by using the same optics as are used to deliver the processing beam, and thus the detection process is entirely nonintrusive. We demonstrate successful operation for welding stainless steel and titanium under both helium and argon gas shielding. © 2001 Optical Society of America.

Original languageEnglish
Pages (from-to)6606-6610
Number of pages5
JournalApplied Optics
Volume40
Issue number36
Publication statusPublished - 20 Dec 2001

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