Measuring and testing – Surface and cutting edge testing
Patent
1974-12-23
1976-09-21
Padgett, Benjamin R.
Measuring and testing
Surface and cutting edge testing
23230R, 250302, 25230119, 252408, G01N 2116, G01N 1908, C09K 1106
Patent
active
039811859
ABSTRACT:
Postemulsifiable dye penetrant inspection system and method employing substantially biodegradable dye penetrant compositions and emulsifiers, for use in non-destructive testing of objects to locate voids and defects therein, the dye penetrant composition consisting essentially of an organic dye, preferably a fluorescent dye, and a carrier or solvent for said dye, in the form of certain straight chain, primary, aliphatic oxyalkylated alcohols, particularly biodegradable surfactants comprised of the nonionic condensation products of linear primary aliphatic alcohols having from 10 to 18 carbon atoms, with ethylene oxide and propylene oxide, preferably in the form of a mixture thereof, or in the form of certain ethoxylated secondary alcohols, particularly the biodegradable nonionic surfactants comprised of ethoxylates of a mixture of secondary alcohols having linear alkyl chains of from 11 to 15 carbon atoms, such surfactants and the resultant dye penetrants having limited water solubility and normally requiring large amounts of water at high pressure for removal of excess dye penetrant from the object surface. An emulsifier is thus employed to treat the penetrant covered object surface and to remove excess dye penetrant, such emulsifier also comprised of the above noted classes of biodegradable nonionic surfactants, but of a composition or nature which are highly soluble and which facilitate removal of the resulting emulsified dye penetrant with water as by spraying.
In the method of application of the posemulsifiable dye penetrant system of the invention, the dye penetrant composition is applied to the surface of an object containing cracks and flaws, the object is contacted, as by immersion, with the emulsifier noted above, and water is applied, as by spraying, to the emulsified penetrant on the surface of the object, without removing dye penetrant from the cracks and defects, and with or without a developer, the surface of the object is viewed under suitable lighting conditions, e.g., ultraviolet or black light when the dye in the penetrant is a fluorescent dye, to locate any cracks or defects in the surface of the body as indicated by colored traces from the dye penetrant remaining in the cracks and flaws.
REFERENCES:
patent: 3108187 (1963-10-01), Thornbury
patent: 3184596 (1965-05-01), Alburger
patent: 3558882 (1971-01-01), Fijalkowski
patent: 3564249 (1971-02-01), Molina
patent: 3716492 (1973-02-01), Graham et al.
patent: 3896664 (1975-07-01), Alburger
Humphries L. Lee
Leland David
Padgett Benjamin R.
Rockwell International Corporation
Silberberg Charles T.
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