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Detecting weld line of steel material through anticorrosion paint by an electromagnetic induction probe
Author(s) -
Koyama Kiyoshi,
Hoshikawa Hiroshi,
Naruse Yuzuru
Publication year - 2005
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20195
Subject(s) - welding , induction coil , synchronizing , signal (programming language) , eddy current , acoustics , electromagnetic coil , excitation , materials science , electromagnetic induction , amplitude , nondestructive testing , electrical engineering , mechanical engineering , optics , engineering , physics , composite material , computer science , topology (electrical circuits) , programming language , quantum mechanics
The authors have developed a new method for detecting position and direction in the weld zone of steel structures such as oil storage tanks and bridges without removing their anticorrosion paint. The method uses a special eddy current probe and detects the position and direction by utilizing the difference of electromagnetic characteristics between the base material and the heat affected zone. The probe comprises two large tangential excitation coils wound orthogonally around each other and a small pancake detecting coil. The excitation coils induce uniform eddy current rotating its direction synchronizing to the alternating excitation current. The signal amplitude from the probe provides information on its position in the weld zone and the signal phase indicates the direction of the probe. Thus, the probe generates the weld signal to effectively follow the weld line in steel structures. The experimental results have shown that the proposed method is promising because the probe provides clear weld signals with little noise and the change of the probe lift‐off from the material causes little variation in the signal. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 153(1): 9–16, 2005; Published online in Wiley InterScience ( www. interscience.wiley.com ). DOI 10.1002/eej.20195