Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 16, Issue 7, Pages 636-641Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1362171811Y.0000000050
Keywords
Fibre laser; Keyhole welding; High speed camera; Flow measurement; Fast Fourier transform
Funding
- VINNOVA (The Swedish Agency for Innovation Systems)
- Jernkontoret (The Swedish Steel Producers Association) [34013]
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This paper presents the results of a high speed video survey of melt flow on the front face of a keyhole created during fibre laser welding. Using fast Fourier transform techniques, quantitative values of fluid flow velocities down the keyhole front have been established. The results have led to a phenomenological understanding of some of the quality problems which arise at excess welding speeds. The downward flow velocity on the keyhole front is found to be generally independent of welding speed, and proportional to laser power.
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