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Investigation on disk and CO2 laser beam fusion cutting differences based on power balance equation

: Scintilla, L.D.; Tricarico, L.; Wetzig, A.; Beyer, E.


International Journal of Machine Tools and Manufacture 69 (2013), pp.30-37
ISSN: 0890-6955
Journal Article
Fraunhofer IWS ()
CO2 laser; disk laser; fiber laser; laser cutting; power balance; process temperature

In this work the calculation of the process temperatures in fusion cutting was carried out based on the power balance approach. Cutting experiments with CO2 and disk lasers were performed on 1,5 and 8 mm thick cold work tool steel sheets. The experimental, numerical and analytical evaluation of the single terms of the power balance equation allowed the explanation of the observed cut quality differences between disk and CO2 laser cuts. Lower process temperatures calculated by a power balance equation for disk laser cuts lead to the increase of viscosity of molten material. The subsequent increase in difficulty for ejection of the molten material from the cut kerf explains the worse cut quality if compared with CO2 laser cuts. Experimental evidence and theoretical calculations showed that the additional physical mechanisms like plasma formation should be considered in the overall power balance under particular cutting conditions.