Advanced technique for non-destructive testing of friction stir welding of metals

Luis S. Rosado, Telmo G. Santos, Moisés Piedade, Pedro M. Ramos, Pedro Vilaça

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)


In this paper a new non-destructive testing (NDT) system focusing on micro size superficial defects in metallic joints is presented. The innovative system is composed by a new type of eddy currents probe, electronic devices for signal generation, conditioning and conversion, automated mechanized scanning and analysis software. The key original aspect of this system is the new type of eddy currents probe. This new probe provides enhanced lift-off immunity and improved sensitivity for micro size imperfections. The probe concept was studied using a Finite Element Method (FEM) tool and experimental verified using a standard defect. The testing results on some friction stir welding (FSW) specimens clearly show that the system is able to detect superficial defects less than 60 μm deep, which significantly increases the actual state of the art in NDT reliability for micro imperfections detection. The system can be applied to a broad range of industries which include manufacturing, maintenance and engineering companies.

Original languageEnglish
Pages (from-to)1021-1030
Number of pages10
Issue number8
Publication statusPublished - Oct 2010


  • Eddy currents probe
  • Friction stir welding
  • Non-destructive testing


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