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Quantitative study of melt flow dynamics inside laser cutting kerfs by in-situ high-speed video-diagnostics

: Arntz, D.; Petring, D.; Stoyanov, S.; Quiring, N.; Poprawe, R.

Fulltext ()

Procedia CIRP 74 (2018), pp.640-644
ISSN: 2212-8271
International Conference on Photonic Technologies <10, 2018, Fürth>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer ILT ()

Within this paper the melt flow dynamics of the laser cutting process during laser cutting of 6 mm thick stainless-steel using a disk laser with a laser power of 5 kW and nitrogen assist gas with a pressure up to 20 bar, is analyzed by in-situ high-speed video-diagnostics (>100,000 fps). An advanced algorithm is used to determine spatially resolved the melt flow dynamics on the laser cutting front. The results reveal a link between the fluid dynamics, the cutting velocity, the assist gas pressure and the average roughness of the cut flank.