Tongov, Manahil, Department of Material Sscience and Technology, Technical University of Sofia <br />Center of welding  (IMSETCHA) “Acad. A. Balevski” Bulgarian Academy of Sciences<br /><em> <br /> </em>, Bulgaria



ERDF co-funded project "Funding of international projects in research and innovation at Rezekne Academy of Technologies" No. 1.1.1.5/18/I/012