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This paper will cover the electromagnetic (eddy current) testing method and ASTM Subcommittee E7.07 on Electromagnetic Method and its activities. The basic principles and applications of the test method are discussed. The advantages and disadvantages are noted. Areas of standardization highlighted are terminology, equipment, test procedure, and reference standards. These referenced standards cover sorting, coating thickness, conductivity, and tubular products.
The background of ASTM Subcommittee E7.07 and its standard chronology are highlighted. The subcommittee's growth from three sections in 1958 to its present ten sections is covered in detail. Extensions of the scope to cover the magnetic method for coating thickness, fringe flux, and the electric potential method are noted. Thirteen documents have been developed by the subcommittee, and six new documents are currently in development. Of high interest currently is the work on wire rope examination standards. Many challenges are presented to ASTM E.07 including: (1) developing documents that can replace DoD specifications and standards, and (2) developing sorely needed documents for wire rope inspection. This paper notes a high level of standard document development currently.
electromagnetic testing, eddy current testing, conductivity measurement, coating thickness measurement, sorting, tubular products inspection, electromagnetic (eddy current)standards, wire rope inspection, fringe flux, electric potential
Consultant, U.S. Army Materials Technology Laboratory, SLCMT-MEE, Watertown, MA