Abstract
This work shows readability of the QR code of the structural alloy Ti2 surface after the thermal influence. The main goal is the readability estimation after exposure to temperatures exceeding operating alloy temperatures and in destruction crash conditions. Contrast and readability were measured by using a Samsung smartphone and the program Adobe Photoshop CC 2017. The graphs of contrast change depending on the heating temperature were drawn. These graphs illustrate that significant changes in contrast are observed in the range from 500 to 600°C due to darkening of the base metal and the substrate, as well as fading of the dark elements of the code.
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