A high speed video survey of melt flow within fiber laser welding keyholes has revealed a number of interesting observations about the mechanics of weld formation. Using Streak Images and FFT (Fast Fourier Transform) techniques to interpret the video results, quantitative values of fluid flow velocities down the keyhole front have been established. The results have lead to a phenomenological understanding of some of the quality problems which arise at high welding speeds - such as undercut and humping.
High speed video analysis of melt flow inside fiber laser welding keyholes
Ingemar Eriksson, John Powell, Alexander F. H. Kaplan; November 27–30, 1990. "High speed video analysis of melt flow inside fiber laser welding keyholes." Proceedings of the International Laser Safety Conference. ICALEO® 2011: 30th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Cincinnati, Ohio, USA. (pp. pp. 221-226). ASME. https://doi.org/10.2351/1.5062239
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