Magnetic particle method using water soluble adhesive for detect

Details Magnetic particle method using water soluble adhesive for detect Magnetic particle method using water soluble adhesive for detect

1980-01-18

1982-07-06

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

By paramagnetic particles

252 6252, G01R 3312, G01N 2784

Patent

active

043385664

ABSTRACT:
Method and composition for detecting flaws in a magnetizable workpiece such as a steel billet in which the workpiece is first heated to a temperature of at least 140.degree. F. (60.degree. C.) in a hot water bath, the heated workpiece is removed from the bath and then magnetized either before or after the application of an indicating composition. In accordance with the present invention, the composition includes ferromagnetic particles, a fluorescent pigment and a water compatible adhesive. The flaws in the workpiece, particularly at seams, cause clusters of the indicating composition to remain to the magnetized piece where they are readily visible to an inspector.

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patent: 3249861 (1966-05-01), Pevar
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patent: 3763423 (1973-10-01), Forster
patent: 3897990 (1975-08-01), Bjerke
patent: 4130800 (1978-12-01), Fuchs
patent: 4172315 (1979-10-01), Marsh

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