Ferrofluid penetrant testing

Details Ferrofluid penetrant testing Ferrofluid penetrant testing

G - Physics

01

N

324/50

G01N 27/84 (2006.01) G01N 27/90 (2006.01) G01R 33/12 (2006.01)

Patent

CA 1291211

CASE 4848 ABSTRACT OF THE DISCLOSURE A method for inspecting the surface of a workpiece for the presence of flaws using a ferrofluid as a penetrant which is applied to the surface of the workpiece and then scanning the surface of the workpiece with electrical detection means placed adjacent to the surface for providing responses indicative of the presence of flaws in the surface of the workpiece. If desired, a magnetic field can be used to induce the flow of the ferrofluid into any flaws prior to inspection, and for post-inspection cleanup as well. By the use of a,ferrofluid, the sensitivity of the electrical detection means, advantageously of the eddy current type, is enhanced in typical applications, and also allows the use of an eddy current probe to inspect workpieces made of nonconduc- tive and/or nonferromagnetic materials.

579073

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