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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 17 — Aug. 26, 2013
  • pp: 19997–20004

Direct observation of keyhole characteristics in deep penetration laser welding with a 10 kW fiber laser

Mingjun Zhang, Genyu Chen, Yu Zhou, and Shichun Li  »View Author Affiliations


Optics Express, Vol. 21, Issue 17, pp. 19997-20004 (2013)
http://dx.doi.org/10.1364/OE.21.019997


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Abstract

Keyhole formation is a prerequisite for deep penetration laser welding. Understanding of the keyhole dynamics is essential to improve the stability of the keyhole. Direct observation of the keyhole during deep penetration laser welding of a modified “sandwich” specimen with a 10 kW fiber laser is presented. A distinct keyhole wall and liquid motion along the wall are observed directly for the first time. The moving liquid “shelf” on the front keyhole wall and the accompanying hydrodynamic and vapor phenomena are observed simultaneously. Micro-droplets torn off the keyhole wall and the resultant bursts of vapor are also visualized. The hydrodynamics on the keyhole wall has a dominant effect on the weld defects. The emission spectrum inside the keyhole is captured accurately using a spectrometer to calculate the characteristics of the keyhole plasma plume.

© 2013 OSA

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3390) Lasers and laser optics : Laser materials processing
(300.6170) Spectroscopy : Spectra
(300.6360) Spectroscopy : Spectroscopy, laser
(150.0155) Machine vision : Machine vision optics
(150.5495) Machine vision : Process monitoring and control

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: April 3, 2013
Revised Manuscript: July 27, 2013
Manuscript Accepted: August 1, 2013
Published: August 16, 2013

Citation
Mingjun Zhang, Genyu Chen, Yu Zhou, and Shichun Li, "Direct observation of keyhole characteristics in deep penetration laser welding with a 10 kW fiber laser," Opt. Express 21, 19997-20004 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-17-19997


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