Laser remelting of thermally sprayed coatings is a promising possibility how to improve their functional properties. However, it requires precise control of processing parameters to achieve desired depth of remelting. In this study, the near-infrared (NIR) camera is used to measure the achieved depth of remelting during diode laser remelting of HVOF sprayed coatings. Possibilities how to evaluate the temperature field in the melting area are presented. The width of melting pool is calculated and it shows high correlation with achieved depth of remelting. The study shows that the NIR measurement can be used for controlling the depth of remelting during a laser remelting of coatings.Keywords: Laser remelting, HVOF coatings, heat post-treatment, infrared diagnostic
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