Non-destructive testing of welded fatigue specimens Sofia Papanikolaou, Dimitrios Fasnakis, Andreas Maropoulos, Dimitrios Giagopoulos, Stergios Maropoulos and Theodoros Theodoulidis MATEC Web Conf., 318 (2020) 01033 Published online: 14 August 2020 DOI: 10.1051/matecconf/202031801033