Real time monitoring of laser beam welding keyhole depth by laser interferometry

J. J. Blecher, C. M. Galbraith, C. Van Vlack, Todd Palmer, J. M. Fraser, P. J. Webster, Tarasankar Debroy

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The utility of a new laser interferometric technique, inline coherent imaging, for real time keyhole depth measurement during laser welding is demonstrated on five important engineering alloys. The keyhole depth was measured at 200 kHz with a spatial resolution of 22 mm using a probe beam, which enters the keyhole coaxially with the process beam. Keyhole fluctuations limited average weld depth determination to a resolution on the order of 100 mm. Real time keyhole depth data are compared with the weld depths measured from the corresponding metallographic crosssections.With the exception of an aluminium alloy, the technique accurately measured the average weld depth with differences of less than 5%. The keyhole depth growth rates at the st art of welding are measured and compare well with order of magnitude calculations. The method described here is recommended for the real time measurement and control of keyhole depth in at least five different alloys.

Original languageEnglish (US)
Pages (from-to)560-564
Number of pages5
JournalScience and Technology of Welding and Joining
Volume19
Issue number7
DOIs
StatePublished - Oct 1 2014

Fingerprint

Laser interferometry
laser interferometry
Laser beam welding
welding
Welds
laser beams
Time measurement
Monitoring
Aluminum alloys
Welding
Imaging techniques
Lasers
depth measurement
laser welding
arts
aluminum alloys
spatial resolution
time measurement
engineering
probes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Blecher, J. J. ; Galbraith, C. M. ; Van Vlack, C. ; Palmer, Todd ; Fraser, J. M. ; Webster, P. J. ; Debroy, Tarasankar. / Real time monitoring of laser beam welding keyhole depth by laser interferometry. In: Science and Technology of Welding and Joining. 2014 ; Vol. 19, No. 7. pp. 560-564.
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Real time monitoring of laser beam welding keyhole depth by laser interferometry. / Blecher, J. J.; Galbraith, C. M.; Van Vlack, C.; Palmer, Todd; Fraser, J. M.; Webster, P. J.; Debroy, Tarasankar.

In: Science and Technology of Welding and Joining, Vol. 19, No. 7, 01.10.2014, p. 560-564.

Research output: Contribution to journalArticle

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