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. 2017 May 10;17(5):1082. doi: 10.3390/s17051082

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© 2017 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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Macrograph (10×) of a shrinkage cavity (longitudinal-sectional C-C of the weld bead of Figure 7) and the correspondent audible signal collected by DAQ NI 9234.