Electricity: measuring and testing – Magnetic – With temperature control of material or element of test circuit
Patent
1981-10-29
1984-07-24
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With temperature control of material or element of test circuit
165 47, 165DIG5, 324226, 324240, 336 57, G01R 3312, G01N 2790
Patent
active
044619952
ABSTRACT:
An eddy current system and method is disclosed for detecting flaws in hot pipe product. The system includes a detector test head (22) having a heat shield (24) defining a generally cylindrical inner wall through which the pipe passes longitudinally. The test head includes structure (50, 62, 64) for spirally directing water onto the inside surface without contacting the hot pipe as it passes through the heat shield. Debris is thereby removed from the space between the shield and the pipe, and the test head is effectively cooled and shielded from the heat of the pipe. Where the pipe is heated above its Curie temperature, such that the pipe is rendered non-magnetic, no normally required saturation coil is needed to magnetically saturate the pipe for eddy current testing, because the coolant flowing over the inner wall cools the test head but does not lower pipe temperature below the Curie point.
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Lennemann et al., Cooling of a Voice Coil Motor for Disk Storages, IBM Technical Disclosure Bulletin, vol. 15, No. 9, Feb. 1973, pp. 2873-2874.
Republic Steel Corporation
Strecker Gerard R.
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