Method for inspecting steel billets with a dry mixture of magnet

Details Method for inspecting steel billets with a dry mixture of magnet Method for inspecting steel billets with a dry mixture of magnet

1981-01-15

1984-02-21

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

By paramagnetic particles

252 6252, 324216, G01N 2784, G01R 3312, H01F 128

Patent

active

044332890

ABSTRACT:
A method and composition for non-destructive testing of magnetizable workpieces such as steel billets. A dry dispersion of ferromagnetic particles in combination with a fluorescent pigment and a water soluble carrier are deposited on the workpiece which is simultaneously or thereafter magnetized. The magnetizable particles are attracted to surface imperfections by the action of the magnetic field and become clustered therein to form indications. The indications are fixed more firmly to the piece by applying an aqueous spray, consisting either of a water mist or steam which activates the water soluble carrier so that upon drying, the indications remain firmly attached to the workpiece. Subsequent examination of the workpiece under ultraviolet irradiation enables the inspector to determine the extent and the location of the flaws.

REFERENCES:
patent: 2267999 (1941-12-01), Switzer
patent: 2936287 (1960-05-01), Kazenas
patent: 3249861 (1966-05-01), Pevar
patent: 3404093 (1968-10-01), Borrows
patent: 3485758 (1969-12-01), Borucki et al.
patent: 3609532 (1971-09-01), Van Kirk
patent: 3897990 (1975-08-01), Bjerke
Mecana-Equipment for Detecting Cracks Facilitate the Targeted Elimination of Defects, Mecana SA, Machinery Works Brochure CH-8716 Schmerikon/Switz. pp. 1-8, Sep. 1976.
Pevar, Maxwell, "New Magnetic Test Includes Stainless Steels" Product Engineering Feb. 6, 1961, pp. 41-43.

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