Method and apparatus for inspecting metal tubes employing magnet

Details Method and apparatus for inspecting metal tubes employing magnet Method and apparatus for inspecting metal tubes employing magnet

1991-03-21

1994-05-10

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324242, G01R 3312, G01N 2772

Patent

active

053111273

ABSTRACT:
The method and the apparatus relate to the detection of faults in the wall of a passing metal tube. A solenoid or solenoids generate two alternating magnetic fields of different frequenceis, the frequencies being chosen from the range of medium and high frequencies, in order to produce in the wall of a tube eddy currents which interact with the faults. The signals resulting from these interactions are detected by at least one detection solenoid and each difference in amplitude D between the signals obtained at the two frequencies for one and the same fault is compared with a specific difference which constitutes a threshold for rejection of the corresponding tube. Application of the method and of the apparatus to the inspection of ferrous or non-ferrous magnetic and non-magnetic metal tubes.

REFERENCES:
patent: 2744233 (1956-05-01), Paivinen
patent: 3916301 (1975-10-01), Vild et al.
patent: 4327419 (1960-12-01), Tornblom et al.
patent: 4355281 (1982-10-01), Toth et al.
patent: 4954777 (1990-09-01), Klopfer et al.

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