Review of Guided Wave Testing Using Magnetostrictive Transducers

Fisher, J.; Southwest Research Institute; USA

Vinogradov, S.; Southwest Research Institute; USA
Fisher, J.; Southwest Research Institute; USA

ID: ECNDT-0486-2018
Download: PDF
Session: Guided Waves techniques 2
Room: G3
Date: 2018-06-14
Time: 15:20 - 15:40

The use of guided waves for long-range inspection of components is a rapidly growing segment of the NDE service business. Magnetostrictive sensors utilizing ferromagnetic strip material for the transduction effect have proven to be very effective for guided wave testing on a variety of components. There is still a demand for enhanced sensor characterization and the development of specific sensor characteristics. A novel magnetostrictive transducer (MsT) utilizing a reversed Wiedemann effect was introduced to the market in 2010 [1] and opened a number of new possibilities in guided wave testing. The most challenging area is structural health monitoring of components operating at elevated temperature. An extremely robust transducer design was developed and tested for this application; it is capable of functioning at high temperatures as well as stresses induced by thermal cycling. Another recent development is an automated omnidirectional probe suitable for screening of large shells such as storage tank walls or bottoms. A number of additional specialized applications of MsTs are presented including testing of boiler tubes, heat exchanger tubes, and buried anchor rods. Performance of the MsT and its limitations for each particular application will be discussed.