SU1462229A1 - Method of flaw detection of metal surface in high-frequency electric field - Google Patents

Abstract

The invention relates to a method of metal flaw detection, a surface in a high-frequency electric field, and makes it possible to simplify the process of detecting defects on a metal surface. Images of the metal surface are formed on a polymeric material. As a polymer material, a film consisting of a mixture of cellulose diacetate and acetic acid mixed cellulose ether with a polybasic carboxylic acid is used with a ratio of components, wt.%: Cellulose diacetate 75-88.9; cellulose acid acetic acid ester c. multi-, basic carboxylic acid .t t, 1-25, placed directly on the analyzed surface. (ABOUT

Description

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The invention seeks to investigate the surface of a metal structure and can be used to detect surface defects by forming an image of a metal surface. la on polikernom material.

The aim of the invention is to simplify the process of detecting defects on a metal surface.

The method is carried out as follows.

EXAMPLE 1: A film consisting of a mixture of 75% by weight of cellulose diacetate (DAC) and a film is placed on a metal surface having defects in the form of slots with a minimum width of 5 microns, connected to a source of high alternating voltage. 25 wt.%

.Acetosuccinate cellulose. (ASC), serves a high voltage of 5 kV at a frequency of 25 kHz for 5 minutes. The material exhibits an image in the form of a relief, which is well viewed in transmitted light. . . .

Example 2. On a metal surface having defects in the form of slots with a minimum width of 5 µm, a film consisting of a mixture of 80 wt.% DAC and 20 wt.% ACT is placed, a high voltage of 5 kV at a frequency of 25 kHz and time is applied. exposure - 5 min. The material exhibits an image of slots in the shape of a relief.

Example 3. On a metal surface having defects in the form of slots with a minimum thickness of 5 μm.

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A film consisting of a mixture of 8.9 wt.% DAC and 11.1 May L ASC is placed; a high voltage of 5 kV is applied at a frequency of 25 kHz and a time of exposure of 5 min. The material exhibits an image of slots in the shape of a relief.

PRI me R 4, On a molded surface having defects in the form of slits of certain sizes (from 200 to 5 microns) 5 a film 5 is placed consisting of a mixture of 6.65.7 micro% DAC and ISSjA wt.% AST |, serves a high voltage of 5 kV at a frequency of 25 kHz and a time-of-field exposure of 5 minutes ,. On. The material has no image of surface defects.

I Example 5. On a metal surface having defects in the form of (spruce with a minimum grain size of 5 µm, (put a film consisting of a mixture of | 90 May L DAC and oil ACS, serves | for example 1 5 kV at a frequency of 25 kHz | and time impact of 5 minutes on the material there is no image of surface defects in the form of slits. I Example B. On a metal surface (a coin-shaped surface connected to a source of high tension iHHHj, a film consisting of a mixture of 80 May L DAC and. 20 May L DSC, serves a voltage of 5 kR at a frequency of 25 kHz and.time.exposure floor 5 W 1 But On, mater A coin is shown in the shape of a relief in the shape of a coin, well viewed in transmitted light. For reproduction it is crawled; The print of a stanuse composed of a mixture of DAC and ASTs with images is used as a negative, and printing is carried out on halide silver la teriale.

Example 7. A film of 5 micron cells, connected to a source of high voltage e, is placed on a metal surface in molds, e grids with a size, eper, high-voltage cells consisting of a mixture of 80 casL DAC and 20% by weight ACS; a voltage of 5 kV is applied. at a frequency of 25 kHz and a time of 1 minute. The material is shown an image of a grid in the shape of a relief. Reproduction of the resulting print is carried out by photo printing on halogen-silver photographic paper using DAC and ASC film as a negative.

Example 8. H, and a metal surface having defects in the form

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slots with an M1-minimum width of 5 µm, a film consisting of a mixture of 75 May LAC and 25 May L cellulose acetobutyrate (ABC) is placed; a high voltage of 5 kV is applied at a frequency of 25 kHz for 5 minutes. The material exhibits an image in the form of a relief, which is well viewed in the passing Q planet.

Example 9. On a metal surface, having defects in the form of slits e with a minimum width of 5 μm,

a film consisting of a mixture of 5–80 May L an DAC and 20 May L ABC is placed; a high voltage of 5 kV is applied at a frequency of 25 kHz and a exposure time of 5 minutes. The material exhibits an image of slots in the shape of a relief.

Example 10. A film consisting of an 88.9% DAC and 11.1 May.% ABC is placed on a metal surface having defects in the form of slots with a minimum width of 5 µm. A voltage of 5 kV at a frequency of 25 kHz and exposure time floor 5 min. The material exhibits an image of slots in the form of a river relief.

Example 11. A metal film consisting of a mixture of 66.7 wt.% DAC and 33.4 May L ABTs is placed on a metal surface with defects in the form of slits of certain sizes (from 200 to 5 microns). A high voltage of 5 kV is supplied at a frequency of 25 kHz and exposure time of half 5 minutes. There is no image of surface defects on the material.

Example 12. On a metal surface that has defects in the form of slots with a minimum width of 5 µm, a film is placed that is from the capacity of 90 May L DAC and 10 May.% ABC, a voltage of 5 kV is applied at a frequency of 25 kHz and a time field 5 min There is no image on the material: Keny is a surface defect in the form of slits.

Example 13. A film consisting of a mixture of 75 wt.% DAC and 25 May.% Cellulose acetophthalate (AFC) is placed on a metal surface having defects in the form of "slits e with a minimum slit width of 5 microns, connected to a high voltage source, A voltage of 5 kV at a voltage of 25 kHz is supplied for 5 minutes. On the material, the image in the form of a relief g is well seen in the passage in the Middle East,

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Example 14. On a metal surface having defects in the form of slots with a minimum width of 5 µm, a film consisting of a mixture of 80 wt.% DAC and 20 wt.% AFC is placed, a high voltage of 5 kV at a frequency of 25 kHz and exposure time is applied half 5 min The material exhibits an image of slots in the shape of a relief.

Example 15. A film consisting of a mixture of 88.9 wt.% DBP and 11.1 wt.% AFC is applied to a metal surface having defects in the form of slots with a minimum width of 5 µm. A voltage of 5 kV is applied at a frequency of 25 kHz. and exposure time floor 5 min. The material exhibits an image of slots in the shape of a relief.

Example 16. A metal film consisting of a mixture of 66.7% by weight, DAC and 33.4% by weight of AFC is placed on a metal surface,: having defects in the form of gaps of certain sizes (200 to 5 mime), 5 kV at a frequency of 25 kHz and a time-exposure field of 5 min. There is no image of surface defects on the material.

Example 17. A film consisting of cMeci is placed on a metal surface that has defects in the form of slots with a minimum width of 5 microns;

462229

90% by weight of the DAC and 10% by weight of the AFC are supplied with a voltage of 5 kV at a frequency of 25 kHz and an exposure time of 5 minutes. There is no image of cracks on the surface of the material.

Form m l l a

the invention

The method of flaw detection of a metal surface in a high-frequency electric field by forming an image of the investigated surface on a polymeric material under the influence of a high-frequency field, characterized in that, in order to simplify the process of detecting defects on a metal surface, the formation of images is performed at con. the tact of the polymer m. material with the surface under study, while a film is used as the polymer material, consisting of a mixture of cellulose diacetate and acid acetosmeg of cellulose ether with polybasic carboxylic acid with the ratio of components, VAT,%: Cellulose diacetate. - Acidic acetomethyl cellulose ester with polybasic to carboxylic acid 11,1-25,0

75.0-88.9

Claims (1)

The formula of the invention is the formation of relief gaps. Example 15. On a metal surface having defects in the form of slots with a minimum width of 5 μm, a film consisting of a mixture of 88.9% of DAC and 11.1% by weight of AFC is placed, and a voltage of 5 kV is applied at a frequency of 25 kHz and field exposure time 5 min. ⁴ The material shows an image of slits in the form of a relief. Example 16. On a metal surface 20 having defects in the form of gaps of certain sizes (200 to 5 mm), a film consisting of a mixture of 66.7 wt.%, DAC and 33.4 wt.% AFC, they supply a high voltage of 5 kV at a frequency of 25 kHz and a time-exposure field of 5 minutes. There is no image of surface defects on the material. 30 Example 17. On a metal surface having defects in the form of slits with a minimum width of 5 μm, a film consisting of a mixture is placed The method of defectoscopy of a metal surface in a high-frequency electric field by forming an image of the test surface on a polymer material when exposed to a high-frequency field, characterized in that, in order to simplify the process of detecting defects -. on a metal surface, the formation of images is carried out by contact of the polymer material with the test surface, while a film consisting of a mixture of cellulose diacetate and acidic acetate mixed cellulose ether with polybasic carboxylic acid acid with a ratio of components,% ss is used as the polymer material: Cellulose Diacetate 75.0-88.9 Acidic acetate mixed cellulose ether with polybasic carboxylic acid 11.1-25.0