Thickness evaluation of thermal spraying on boiler tubes by eddy current testing

Issue title: Selected Papers from the 15th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2011)

Article type: Research Article

Authors: Takahashi, Yohei^a | Urayama, Ryoichi^b | Uchimoto, Tetsuya^{b; *} | Takagi, Toshiyuki^b | Naganuma, Hiroshi^c | Sugawara, Kazufumi^c | Sasaki, Yoriaki^c

Affiliations: [a] School of Engineering, Tohoku University, Sendai Miyagi, Japan | [b] Institute of Fluid Science, Tohoku University, Sendai Miyagi, Japan | [c] Technical Research & Development Center, Tohoku Electric Power Engineering and Construction Co. Inc., Miyagi, Japan

Correspondence: [*] Corresponding author: Tetsuya Uchimoto, Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan. E-mail: uchimoto@ifs.tohoku.ac.jp

Abstract: This paper discusses the feasibility of thickness evaluation of Ni-based alloy coating sprayed on type 304 austenitic stainless steels by swept frequency eddy current testing which measures the impedance spectra of coil. Comparing the experimental signals with the numerical ones, the electromagnetic models of coating are developed. Using these models, the inverse analyses are conducted. The coating thicknesses are estimated within the maximum error of 22 μm.

Keywords: Thermal spraying, coating thickness, swept frequency eddy current testing, inverse analysis

DOI: 10.3233/JAE-2012-1491

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 39, no. 1-4, pp. 419-425, 2012