Penetrant inspection
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1 \ Small cracks that can not be seen with the naked eye occur on the material surface 2 \ Application of penetrant liquid 3 \ Remove unnecessary penetrant remaining on the surface 4 \ Apply the developer to reveal the location of the crack
Permeation Scratch Inspection(Shin Tan Shoten,: penetrant inspection, abbreviation:PI) is a kind of law of. penetrant examination (: Penetrant testing, abbreviation:PT ) Also called. Scratches () opened on the material surface can be found out. Although it can be used for almost all materials except good ones and porous () ones, it can only detect scratches with openings on the surface.
The penetrant inspection is one inspection method by a combination of the following observation method, excessive penetrant removal method, and development method:
- Classification by observation method (Type): Dye penetrant inspection and Type 1 fluorescent penetrant inspection
- Classification according to removal method of excess permeated liquid (Method): Method C Solvent removability penetrant inspection inspection · Method A water wash penetrant inspection · Method D post-emulsification penetrant inspection
- As a developing method, a fast dry developing method, a wet developing method, a dry developing method, a no developing method
For example, "Solvent removability, Dye penetrant inspection, Quick drying method" and so on. In particular, dyeing penetrant inspection using a solvent for removal of penetrant isDye check(dye Sometimes it is called check.
table of contents
Dye penetrant inspection
The major flow of dye penetrant inspection is as follows:
1. Pretreatment - cleaning the surface 2. Penetration treatment - application, penetration of penetrant 3. Cleaning process - removal of permeate 4. Developing process 5. observation 6. Post-treatment - Removal of developer
Firstly, the surface of the material to be tested is cleaned and dried, then a penetrant for inspection (such as red) is applied to impregnate the crack. Besides spraying, there are also methods such as brush coating for application. The penetration time is determined by the type of penetrant, the material and temperature of the specimen, etc. (In general, it may be longer than 5 to 10 minutes). Once the appropriate penetration time has elapsed, the permeate solution is removed once from the material surface. As already mentioned, there are water washing and solvent based methods. At this time, moderate washing is required such that the penetrant remains only in the crack (for example, cleaning solution is not sprayed directly, but is included in wiping etc.). When the surface dries, apply a developing solution (such as white). As a result, the penetrant penetrating into the cracks oozes out to the surface of the material and draws a pointing pattern. After observation and determination are visually observed within a predetermined period of time, the penetrant liquid and developing solution on the surface of the material are removed and the process is ended.
Fluorescent penetrant inspection
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Fluorescent penetrant inspection () uses as, and the inspection is to see the fluorescence from the darkroom (official name: ultraviolet irradiation lamp) applied. Since it is generally more sensitive than dyeability, it is a method mainly used in aviation field.
Benefits and limitations
As with other nondestructive inspections, it is possible to detect cracks without using materials, so it can be used for inspection of all articles of shipment. Particularly, dyeing penetrant inspection has a great advantage that it can be easily carried out on site without the need for special equipment. Also, unlike methods using electric / magnetic methods such as magnetic particle flaw detection inspection and eddy current inspection by electromagnetic induction, the point that it is generally applicable also to nonmetallic materials is excellent.
On the other hand, any penetrant inspection method has the disadvantage that it can only detect cracks exposed on the surface. Furthermore, in principle, it can not be applied to a material having a porous surface having a property of absorbing liquid (certain metal materials, etc.). When it seems that cracks are present inside the material, it is necessary to use another non-destructive inspection method such as.
standard
- ASTM: ASTM E 1417 / E 1417 M
- Japan: JIS Z2343
footnote
1. ****Cracks are cracks that occur in places where large amounts are required. Because crack edges are very small, concentration is concentrated, cracks gradually progress, leading to a decrease in the strength of the material.
References
- Japan Airlines Technical Association edited "Basic Techniques of Aircraft (Rev.2-2)" Japan Airlines Institute of Technology, pp. 395 - 398.
Affiliate
- \ - Production and sales of ultraviolet endoscopes.
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Post Date : 2018-01-26 07:00
This article is taken from the Japanese Wikipedia Penetrant inspection
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