ASSESSMENT OF MICROSTRUCTURE CHANGES IN HEAT AFFECTED ZONE OF CARBON STEEL WELDS BY PHASED ARRAY PROBES

1,2 ZAVADIL Tomáš
Co-authors:
2 ŽBÁNEK Petr 3 MOŘKOVSKÁ Marie
Institutions:
1 Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic, EU, zavadilt@atg.cz
2 ATG – Advanced Technology Group s.r.o., Prague, Czech Republic, EU, zbanek@atg.cz
3 VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, mar.morkovska@gmail.com
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
849-854
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
31 views / 9 downloads
Abstract

Welding is one of the so-called special processes that require verification to ensure correct execution in sufficient quality. Low-quality weld is not satisfying the requirements for in-service operation, either due to presence of defects (e.g. cracks, lack of fusion, porosity), or due to undesirable microstructure changes in heat-affected zone, that causes degradation of the weld joint. Welds are the main topic of NDT that searches for defects. The main method for detection of internal defects is the ultrasonic testing, that recently saw many new applications. This article shows how to use Phased Array probes to detect microstructure changes due to failure to follow the welding procedure. It was experimentally confirmed that the technique is able to identify microstructure changes in heat-affected zone created by change of welding parameters or by poor restart. The technique may be in principle performed in parallel with ultrasonic testing for defects, so it is possible to be used one instrument to perform complex assessment of weld joint quality.

Keywords: phased array, ultrasonic testing, welding, structural changes
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