AN EVALUATION METHOD OF DEFECTS AND CRACKS IN STEEL STRUCTURE BY EDDY CURRENTS

Abstract

We newly developed a non-destructive and non-contact electromagnetic testing method. The testing method uses magnetic fields produced by eddy currents in steel members. In this report, followings were described ; 1. Outline of newly developed a testing method and a device. 2. Evaluation of performance of the device to investigate defects or cracks in steel members and welded joints. 3. Analysis of three-dimensional magnetic fields produced by the device. From the experiments and discussions, we obtained conclusions that the device can detect defects and cracks accurately without removing fire resistive covering and the device's passing through defects and cracks.