Patent ID: 9535012
Date: 2017-01-03
CPC Classifications: G01N

Claim:
1. A method for the non-destructive testing of a workpiece surface of a workpiece by fluorescent penetrant testing or dye penetrant testing, wherein the method comprises: (a) cleaning a region of the workpiece surface which is to be examined; (b) applying a liquid fluorescent penetrant or a liquid non-fluorescent dye penetrant to the region of the workpiece surface which is to be examined, thereby allowing the penetrant to penetrate into possible recesses in the workpiece surface; (c) removing excess penetrant from the workpiece surface; (d) applying a developer to the region of the workpiece surface which is to be examined and from which excess penetrant has been removed; (e) bleaching the penetrant by a gaseous or liquid oxidant in a layer formed by applied developer on the workpiece surface; and (f) visually assessing penetrant that has remained in the recesses present in the workpiece surface.