Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1981-10-05
1985-03-05
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324220, 324238, 324262, G01N 2772, G01R 3312
Patent
active
045033935
ABSTRACT:
Apparatus for detecting flaws in the threaded end of a ferromagnetic pipe is disclosed. The apparatus comprises means for applying a magnetic force to produce a field generally axially through the threaded end of the pipe, first and second means adjacent successive crests of a thread for sensing a generally radial magnetic field and generating a first and second signal corresponding to the sensed magnetic fields, and means for differentially connecting the signals generated by said first and second sensing means, whereby a differential output signal is produced in response to a flaw between the crests of the thread being inspected. The apparatus also comprises means for helically rotating said sensing means to follow a path corresponding to the threads of the pipe, whereby the first and second signals vary with time.
A method for detecting flaws in the threaded end of a ferromagnetic pipe is also disclosed. The method comprises the steps of applying a magnetic force to produce a field generally axially through the threaded end of the pipe, sensing the radial magnetic field adjacent successive crests of a thread of the pipe, generating first and second signals corresponding to the sensed magnetic fields, and differentially connecting the first and second signals.
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Balter Floyd A.
Kusenberger Felix N.
Moyer Mark C.
Perry William D.
Petersen Clifford W.
Delflache Marc L.
Exxon Production Research Co.
Snow Walter E.
Strecker Gerard R.
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