Indicator penetrant method for fluorescent liquid penetrant inspection

 

(57) Abstract:

The invention can be used in automotive, aviation, aerospace and other industries. Indicator penetrant method for fluorescent liquid penetrant testing contains the phosphor of Normal And on the basis of the high-boiling fraction Norilsk oil and the carrier of the indicator fluid. It differs by the fact that as the carrier contains a working fluid R j-3 - a by-product of deep hydrogenation of a kerosene fraction having a flash point of 80 86oWith the following ratio of components, wt.%: the phosphor of Normal And on the basis of the high-boiling fraction Norilsk oil 13 - 17, the working fluid R j-3 - a by-product of deep hydrogenation of a kerosene fraction having a flash point of 80 80o83 - 87. The technical result is an increase in the level of sensitivity of the indicator of penetrant.

The invention relates to an indicator penetrants used in penetrant methods of inspection of various parts, components and assemblies, and can be used in automotive, aviation, aerospace and other industries.

Known indicator penetrant (Century A. Koryakin, A. S. Borovikov "Ornoy liquid: kerosene - 65%, gasoline B-70 - 10%, as an indicator: Normal B + emulsifier OP-7 -3 g/l to 25%. Specified penetrant has a number of disadvantages: high fire danger, as the flash point of kerosene 40-48oC, gasoline 34-38oC, and only provides a medium level of sensitivity when detecting cracks disclosure of 3 μm or more.

The closest analogue to the proposed indicator penetrant is an indicator penetrant method for fluorescent liquid penetrant inspection, described in the book: Century A. Karyakin, A. S. Borovikov "Fluorescent and capillary), engineering, 1972, page 228. Penetrant contains organic dye - phosphor of Normal And on the basis of the high-boiling fraction Norilsk oil 15 wt.% and the carrier of the indicator fluid is kerosene 85 %. The specified indicator penetrant has the same drawbacks as the first analogue.

The invention is directed to improving the sensitivity of the indicator of penetrant, and reducing the fire hazard properties.

The invention consists in that in the indicator penetrant method for fluorescent liquid penetrant inspection, containing an organic dye - Normal And in the number of 13-17%, and while from a well-known fact, that as the carrier of the indicator fluid it contains the working fluid R j-3 - a by-product of deep hydrogenation of a kerosene fraction having a flash point 80-86oSince, in the amount 83-87 wt.%.

Studies have shown that the use of indicator of this penetrant composition significantly enhances the sensitivity of the indicator of penetrant in comparison with the prototype. Limit values components selected based on the fact that the increase in the content of the phosphor Normal And above the limit values leads to an increase in density of the solution, and hence to reduce the penetration, the lower the sensitivity. Reducing the limit of the content of phosphor leads to the change of emission color of the phosphor under ultraviolet light from yellow to blue. It is known that organic matter (lint, dust) on the surface of the test object, glow in ultraviolet light blue. Therefore, by reducing the content of phosphor lower limit is considerably complicated decoding defects on the test object.

Information confirming the possibility of carrying out the invention

In Oslo a solution, where the organic solvent used working fluid RJ-3 (TU 38.1001964-83), the flash point of which 80oC, and as the organic dye - phosphor "Normal AND" (TU HTSR-85).

Example. For fluorescent penetrant method is obtained by dissolving 15 g of the phosphor Normal And 85 g of the working fluid R j-3. The flash point of the solution 87oC. the Limit value of the components by weight: RJ-3 - 83-87%, Noryl And - 17-13%.

The test indicator of penetrants on the certified control samples with cracks of different disclosure, it was found that they provide high sensitivity, revealed cracks disclosure of 1 μm or more. Known prototype provides a medium level of sensitivity, detects cracks disclosure of 3 μm or more.

The proposed indicator penetrant method for fluorescent liquid penetrant inspection has compared to the prototype of a high level of sensitivity. Simplified the cooking process and reduces the fire risk indicator of penetrant.

Indicator penetrant method for fluorescent liquid penetrant inspection, containing the phosphor of Normal And the quality of the carrier of the indicator fluid it contains the working fluid RJ-3 - a by-product of deep hydrogenation of a kerosene fraction having a flash point of 80 86oC in the following ratio, wt.%:

The phosphor of Normal And on the basis of the high-boiling fraction Norilsk oil - 13 - 17

The working fluid R j-3 - a by-product of deep hydrogenation of a kerosene fraction having a flash point of 80 86oC - 83 - 87

 

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