Estimating Al 1230 clad thicknesses over Al 2024 alloys using apparent eddy current conductivity measurements. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Ansari, Zain A; Abu-Nabah, Bassam A; Alkhader, Maen; Muhammed, Adnan
• Is Part Of: Journal of physics. Volume 1777:Issue 1(2021)
• Publication Date: 2021-02
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1777/1/012044
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: The recent developments in apparent eddy current conductivity (AECC) spectroscopy have made it a viable candidate for clad thickness estimation where both clad and substrate are nonmagnetic metals. It negates the previous requirement of establishing a probe characteristic curve with a consistent lift-off distance between the measured sample and the calibration blocks. This eliminates the adverse effects in measurement uncertainty that occurred earlier due to liftoff variations. This study presents a practical approach for clad thickness estimation using AECC spectroscopy targeting clad thicknesses relevant to the industry. The technique once validated both numerically and experimentally has shown to deliver a measurement uncertainty of 3% over the entire coating thickness range of interest at a ±25.4μm lift-off range. Furthermore, it also reduces the coil diameter requirement to as low as 3 mm without the need of any correction factors.