Full penetration detection in Nd: YAG laser welding by analysis of oscillatory optical signals: Application to overlap weld-seam tracking

Duncan P. Hand, Frank Haran, Christopher Peters, J. D C Jones

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We describe a non-intrusive optical sensor for process monitoring of Nd:YAG laser welding, using light returned through the core of the power delivery optical fiber. This sensor is referred to as the core power monitor (core PM), and uses the delivery fiber to collect the broadband light generated in the process, which is then divided into spectral bands (designated as UV/visible and IR). These optical signals exhibit a characteristic oscillatory intensity modulation within the frequency range 2 - 5 kHz, which is believed to arise from a combination of keyhole, and weld pool oscillations. The frequency content may be related to the size and shape of the welding keyhole, and an alarm system for overlap weeding has been developed based on this principle. This can detect both misalignment of the focused laser spot off the seam, and any excessive gap between the plates. ©2005 Copyright SPIE - The International Society for Optical Engineering.

Original languageEnglish
Pages (from-to)534-537
Number of pages4
JournalProceedings of SPIE - the International Society for Optical Engineering
Volume3092
DOIs
Publication statusPublished - 1997
EventXI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference - Edinburgh, United Kingdom
Duration: 25 Aug 199625 Aug 1996

Keywords

  • Laser welding
  • Process monitoring
  • Seam tracking

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