Detection of corrosion fatigue in boiler tubes using a spike EMAT pulser
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United States of America Patent
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Oct 3, 2000
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app pub date -
Jun 26, 1998
filing date -
Jun 26, 1998
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Abstract
A method of detecting damage in a ferromagnetic workpiece such as a boiler tube positions a pair of EMAT coils adjacent to the workpiece at a non-zero angle with respect to one another. A spike pulse is applied to one of the EMAT coils for generating a horizontally polarized shear wave in the workpiece which is capable of being reflected by a flaw, and the amplitude of a reflected wave from any flaw is received at the other EMAT coil and analyzed and compared to a predetermined percent of an amplitude of a calibration standard flaw to establish the presence of the flaw.
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