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Volume 4, Issue 4 (Suppl) J Laser Opt Photonics, an open access journal
ISSN: 2469-410X Optics 2017
November 15-17, 2017
November 15-17, 2017 | Las Vegas, USA
8th International Conference and Exhibition on
Lasers, Optics & Photonics
Diagnostics of laser remelting of thermally sprayed coatings using an infrared camera
Marek Vostřák, Jiří Tesař, Šárka Houdková and Milan Honner
University of West Bohemia, Czech Republic
Laser remelting of thermally sprayed coatings is a promising possibility how to improve their functional properties such as
wear and corrosion resistance. To achieve the optimal results and the desired depth of remelting, it requires a precise control
of laser process parameters. However, any suitable control of laser remelting process by means of infrared measurement was yet
not described. In this study, a high-power diode laser was used to remelt the HVOF sprayed stellite coatings. Samples with a
different coating/substrate thickness ratio were utilized and by variating the process speed the different depth of remelting was
achieved. The remelting process was recorded by the combination of a Long Wavelength Infrared (LWIR) and a Near Infrared
(NIR) camera. The experiment was designed to find the most suitable method for diagnostics of a remelting process. The
possibilities of evaluation of a temperature field in the interaction zone are presented. The width of melting pool is calculated
from the evaluated temperatures and then correlated with the measured depth of remelting. The approximations of their
mutual dependence show very high correspondence. It indicates that this measurement can be used for controlling of the depth
of remelting, regardless of the samples dimensions.
Biography
Marek Vostřák is a PhD candidate in the field of Laser Technologies. In 2010, he has received his Master’s degree in Applied Physics from the University of West
Bohemia and he has been a Researcher in the New Technologies Research Centre since then. His research is focused on laser cladding and laser remelting
and utilization of thermography measurement in these technologies. He is an author and co-author of numerous outcomes of applied research and some notable
publications in this area, the most recent one is “Diagnostic of laser remelting of high velocity oxygen fuel sprayed stellite coatings using an infrared camera
published in Surface and Coatings Technology volume 318 (2017): 360–364.
Marek Vostřák et al., J Laser Opt Photonics 2017, 4:4 (Suppl)
DOI: 10.4172/2469-410X-C1-017