Method and means for improving flaw entrapment efficiency in wat

Details Method and means for improving flaw entrapment efficiency in wat Method and means for improving flaw entrapment efficiency in wat

1975-02-28

1976-02-03

Morris, Theodore

Measuring and testing

Surface and cutting edge testing

106 19, 2523012P, 427 8, G01N 2904, G01N 1302

Patent

active

039357317

ABSTRACT:
An improvement in inspection penetrant processes for the detection of surface defects in test bodies, wherein a water-washable penetrant of the balanced surfactant/synergist type or of the slow-solubility type is inhibited with respect to its solubility in wash water to the point of substantial insolubility except in the presence of mechanical agitation or application of a vigorous spray of wash water, thereby enhancing the flaw entrapment efficiency of penetrant indications. The inhibition or depression of solubility is achieved by any one or a combination of several techniques; (1) raising the temperature of the wash water to above a critical point of solubility inversion, (2) dissolving a solubility-inhibiting solute in the wash water or in the penetrant, and (3) allowing a solubility-producing constituent to evaporate from the penetrant.

REFERENCES:
patent: 2764556 (1956-09-01), Sockman et al.
patent: 3386920 (1968-06-01), Alburger
patent: 3558882 (1968-12-01), Mlot-Fijaikowski

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