Method of nondestructively inspecting for flaws in metal stocks

Details Method of nondestructively inspecting for flaws in metal stocks Method of nondestructively inspecting for flaws in metal stocks

1989-08-18

1991-08-20

Wieder, Kenneth

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324237, 324238, G01N 2790, G01R 3312

Patent

active

050417860

ABSTRACT:
A method of nondestructively inspecting a magnetic substance such as metal pipe and bar stocks, wherein the method provides a detection coil having a diameter which is specified based on the length of existent peripheral surface flaws such that the directional sensitivity of the detection coil relative to those flaws is improved. The magnetic substance is moved along an axis thereof and has an eddy current induced therein. Relative rotation of the detection coil around the magnetic substance is effected to permit detection of surface flaws.

REFERENCES:
patent: 3588682 (1971-06-01), Forster
patent: 3906357 (1975-09-01), Runshang
patent: 3964740 (1972-09-01), Bergstrand
patent: 4507610 (1985-03-01), Nakaoka
patent: 4534405 (1985-08-01), Hulek et al.
patent: 4628261 (1986-12-01), Huschelrath et al.
patent: 4641092 (1987-02-01), Sakamoto et al.

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