In Situ Optical Observations Of Keyhole Dynamics During Laser Drilling
APPLIED PHYSICS LETTERS(2013)
Abstract
To better understand the laser drilling process and especially to clarify keyhole dynamics in metal drilling, a quasi-two-dimensional drilling assembly was set up with a thin sandwich structure. Keyhole dynamics coupling multiple physical processes were recorded using highspeed photography, and clear images were obtained. The formation of keyholes was found not to be a single unified process, and the whole drilling process could be divided into five stages: an initial melt ejection, mild melting, rapid drilling, hole expansion, and backflow and recasting. As the keyhole evolved, the removal of material changed. (C) 2013 AIP Publishing LLC.
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Key words
Keyhole Formation,Laser Welding,Micromachining
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