Electricity: measuring and testing – Magnetic – Plural tests
Patent
1978-08-02
1980-08-19
Rolinec, Rudolph V.
Electricity: measuring and testing
Magnetic
Plural tests
324242, 324151R, G01R 3312, G01R 104
Patent
active
042186510
ABSTRACT:
Apparatus for detecting defects such as fissures in the ferrous metal of elongated workpieces such as pipe may take the form of wall thickness and material continuity inspection apparatus that is located at an inspection site, with the inspection site being provided to receive an elongated metal workpiece such as a section of drill stem. A movable magnet support structure is located at the inspection site and carries a magnet and coil assembly in movable shoe means that is capable of engaging the outer periphery of the workpiece and establishing a predetermined spaced relationship between the workpiece, the magnet and the coil. The magnet support shoe, together with the magnet and coil, are movable in helical manner about the workpiece, causing the shoe to traverse the entire outer periphery of the workpiece during a single inspection pass. The magnet is arranged to generate a small localized elongated magnetic field within the workpiece, which elongated field is oriented with respect to the longitudinal axis of the workpiece with the lines of flux of the magnetic field being transversely oriented with respect to the longitudinal axis of the workpiece. Thus oriented, the magnetic field enables electronic detection of longitudinal fissures in the workpiece as it traverses the length of the workpiece. An electric current is induced in the coil, which is oriented substantially 90.degree. to the flux of the magnetic field, and modifications in the flux, and thus the current induced in the coil, are detected and relayed to suitable electronic equipment for amplification and display in any suitable manner. A second magnet and coil assembly provided by movable magnet and coil-carrying shoes may be provided having transversely oriented elongated magnetic field means with the lines of flux of the magnetic field means defining planes that are parallel with the longitudinal axis of the workpiece. The transversely oriented elongated magnetic field means are provided for the purpose of detecting transverse flaws or imperfections in the workpiece during the same inspection pass. An induction process is also provided for detecting variations in wall thickness of the workpiece being inspected.
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Rolinec Rudolph V.
Snow Walter E.
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