Research On Pulse Eddy Current Detection Technique of Thinning Defects In the Aluminum-Steel Structure of Wing Wall Plate

Owing to the variation in metal activity, the aluminum-steel structure of wing wall panels is particularly susceptible to galvanic corrosion. Because of the concealed nature of the defects and the significant disparity in the physical properties of the materials, detecting thinning defects in aluminum-steel structures proves highly challenging. To tackle these issues, this study introduces a pulsed eddy current detection technique capable of accurately identifying various types of thinning defects within aluminum-steel structures. First, finite element simulation software is employed to establish the detection model, constructing the mapping relationship between the characteristic signal and thinning through simulation signal analysis. Second, the defect identification classification space and the inversion curve for thinning are developed. Finally, a pulsed eddy current detection system is developed to validate the proposed defect classification and quantification method. Experimental results demonstrate that the method effectively identifies and quantifies various thinning defects in the aluminum-steel structures of wing wall panels.