Abstract
Nondestructive test techniques based on the principle of eddy currents are being widely used in manufacturing industries to assure internal and surface qualities of materials and components. A problem often encountered in the nondestructive testing of ferrous products is the residual magnetism introduced by some manufacturing processes prior to the testing. Existing industrial specifications on the acceptable level of residual magnetism prior to eddy current testing are considered too conservative. The purpose of this investigation was to determine experimentally the change in eddy current flaw signal amplitude as a function of residual magnetic field intensity in ferrous products. Specimens having artificial flaws of known dimensions were eddy current tested at different frequencies and at different residual magnetic field intensities. Results of these experiments are discussed in this paper.
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