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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The view of microstructure (decarburization) on the material surface after heating: (a) in a manual current process, (b) in the newly developed heating system (with the use of an optical microscope Olympus GX51).