Magnetic field strength indicator for use prior to a magnetic pa

Details Magnetic field strength indicator for use prior to a magnetic pa Magnetic field strength indicator for use prior to a magnetic pa

1989-09-05

1991-10-08

Snow, Walter E.

Electricity: measuring and testing

Magnetic

By paramagnetic particles

324202, G01N 2784, G01R 3312, G01R 3500

Patent

active

050557831

ABSTRACT:
A field strength indicator for a magnetic particle inspection process is used to determine field strength and direction sufficient to identify real flaws in a test piece. The field strength indicator is a substantially flat shim having at least one series of artificial flaws formed therein by electric discharge machining. The artificial flaws have a geometry which render them compatible with real flaws and thus enable the magnetic field strength and direction to be properly set for conducting a magnetic particle inspection procedure. The surface containing the artifical flaws must be covered with a thin inert and non-magnetic coating for proper operation.

REFERENCES:
patent: 4133227 (1979-01-01), Crowe et al.

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