Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-07-31
1987-02-17
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324228, G01N 2782
Patent
active
046442723
ABSTRACT:
An eddy current system and method for hot annealed weld inspection is disclosed for use on metallic workpieces such as steel pipe. An annealer produces strong alternating fields to heat the weld. A nearby exciter coil produces test eddy currents within the workpiece at a carrier frequency. Detector circuitry including a demodulator and a detector coil senses defects within the workpiece as evidenced by nonuniformities in the test eddy currents, in response to which the detector coil produces a flaw indicating signal modulated on the carrier frequency. The carrier frequency is automatically maintained at a non-integral multiple of the annealer alternating frequency. A variable band pass filter between the demodulator and detector coil is automatically maintained with its pass band substantially centered upon the carrier frequency.
REFERENCES:
patent: 3057985 (1962-10-01), Biringer
patent: 3130363 (1964-04-01), Camp et al.
patent: 3302105 (1967-01-01), Libby et al.
patent: 3431382 (1969-03-01), Esche et al.
patent: 3588682 (1971-06-01), Forster
patent: 3716908 (1973-02-01), Rowell
patent: 3753085 (1973-08-01), Morton et al.
patent: 3816690 (1974-06-01), Mittelmann
patent: 3821456 (1974-06-01), Havas
patent: 3825820 (1974-07-01), Flaherty et al.
patent: 4123708 (1978-10-01), Vild et al.
patent: 4144494 (1979-03-01), Pawelletz et al.
patent: 4191922 (1980-03-01), Harris et al.
patent: 4237419 (1980-12-01), Tornblom et al.
patent: 4368429 (1983-01-01), Jamison
patent: 4387338 (1983-06-01), Hecht et al.
patent: 4393598 (1983-07-01), Powell et al.
patent: 4461995 (1984-07-01), Harris
patent: 4475083 (1984-10-01), Linder
patent: 4562738 (1986-01-01), Nakayama et al.
patent: 4596953 (1986-06-01), Nagasaka et al.
Eisenzopf Reinhard J.
Mueller Robert W.
Republic Steel Corporation
LandOfFree
Hot annealed weld inspection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hot annealed weld inspection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hot annealed weld inspection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1939433