Development of New Low Frequency ECT Sensor to Detect Inner Defects(I) - Characteristic of Loss of Induced Electromotive Force -

Park, Jeong-Ung; Jang, Mun-Seok; Gim, Guk-Ju; Kim, Beom-Ki

doi:2015.33.4.57

J Weld Join > Volume 33(4); 2015 > Article

Research Paper

Journal of Welding and Joining 2015;33(4):57-62.
DOI: https://doi.org/10.5781/JWJ.2015.33.4.57 Published online August 31, 2015.

Development of New Low Frequency ECT Sensor to Detect Inner Defects(I) - Characteristic of Loss of Induced Electromotive Force -

Jeong-Ung Park^*, Mun-Seok Jang^**, Guk-Ju Gim^***, Beom-Ki Kim^***

Correspondence: Jeong-Ung Park,
Email: jupark@chosun.ac.kr

Abstract

Non-destructive techniques are used widely in the metal industry in order to control the quality of materials. Eddy current testing(ECT) is one of the most extensively used non-destructive techniques for inspecting electrically conductive materials at very high speeds that does not require any contact between the test piece and the sensor. The New ECT sensor which can detect inner defects was developed regardless the condition of surface. This sensor is verified to do experiment which measure the loss of induced electromotive force. The loss of induced electromotive force was measured in 5.4% and this low frequency ECT device can detect internal defects at depth 20 mm.

Key Words: Non-destructive techniques, Eddy current testing, Loss of induced electromotive force, Low frequency ECT