JPS61228334A - Liquid penetrant removing agent for liquid penetration flaw detection test - Google Patents

Abstract

PURPOSE:To easily and certainly perform the flaw detection of a specimen having a complicated shape by simply removing the powdery adsorbent having adsorbed the liquid penetrant remaining on the surface of the specimen by using a brush or by sucking, by using an inorg. or org. powder adsorbing the liquid penetrant for a flaw detection test as a removing agent. CONSTITUTION:A powder 6 (liquid penetrant removing agent) with a particle size of 5-20mum such as an inorg. powder such as an Al2O3 or SiO2 powder, starch such as wheat flour or an org. pigment powder is scattered on the liquid penetrant 2 for a flaw detection applied to the surface of a specimen 1. After the powder 6 adsorbed the excessive liquid penetrant 2 sufficiently, said powder 6 is removed by using a brush or by sucking. After removal, a developer 5 is sprayed to uniformly coat the surface of the specimen 1 to develop an aperture flaw 3. By this method, the aperture flaw 3 of the specimen 1 having a rough surface state or a complicated shape can be simply and certainly detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a penetrant remover for liquid penetrant testing, and more specifically to a method for applying a penetrant to a predetermined part of the surface of a specimen where an opening defect is assumed to exist. Then, the penetrating liquid is removed so that the penetrating liquid that has penetrated into the opening defect remains, and then a developer is applied to the predetermined area to reveal the opening defect in which the penetrating liquid remains. Liquid Penetrant Test ↓ This relates to materials used to remove penetrant liquid applied to the surface of the specimen.

[Prior Art] A liquid penetrant testing method for a test object as shown in FIG. 2a has been known. This type of liquid penetrant testing method involves applying the penetrating liquid 2 to the specimen 1, as shown in Figure 2b, and removing the excess penetrant by wiping it off with a cloth impregnated with a solvent or using pressurized water. This is done by washing with water. Table 1 shows the combinations of penetrating liquid 2 and developer 5 used in the liquid penetrant testing method and the processing procedure.

Table 1 Among the penetrants shown in Table 1, the dyeing penetrants are:

Applicable for testing either large plants or mechanical parts, fluorescent penetrants require a dark room and black light and are suitable for testing small mechanical parts. Furthermore, regarding cleaning methods, it is generally said that the method of removing penetrating liquid using a solvent has a higher defect detection sensitivity and is more advantageous than the method of removing the penetrating liquid using water washing. law is applied. Furthermore, in the case of automatic continuous cleaning, a water washing method is applied. Next, regarding the developing method, the quick-drying type is a spray type and is convenient to carry, so it is used for testing large plants and large machines.

Furthermore, the non-developing method is applied to testing rotating objects.

[Problems with the conventional technology] In the conventional liquid penetrant testing method, when the penetrant is applied to the surface of the specimen where an open defect is assumed to be present, and then the penetrant is wiped off with a cloth soaked in a solvent, etc. In this case, the wiping time increases and pseudo-defects remain due to unwiping, and when washing with water, the penetrating liquid remaining in the open defects disappears due to over-cleaning.
In general, the detection of opening defects requires a considerable degree of skill and also requires a large number of man-hours.

[Means for Solving the Problems] As a result of intensive studies by the present inventors in order to solve the above-mentioned problems of the prior art, the present inventors found that wiping with a cloth impregnated with a solvent, etc., which had been adopted in the prior art, Instead of removing the penetrant by pressurized water washing, if the penetrant is removed from the surface of the object using an inorganic powder and/or an organic powder that has the property of adsorbing the penetrant, the liquid penetrant test method becomes simple and quick. The present invention was completed by discovering that it can be carried out reliably.

Therefore, the present invention resides in a penetrant liquid removal agent for liquid penetrant testing, which is characterized by being made of an inorganic powder and/or an organic powder that has the property of adsorbing a penetrant liquid.

The present invention will be explained in more detail below.

As the penetrating liquid remover of the present invention, any substance can be used as long as it has the property of adsorbing the penetrating liquid.
Alumina (A120s) - silicon dioxide (Si02)
, lime (CaCO3), clay, cement, ceramics, and other inorganic powders, wheat flour, potato starch, bean flour, rice flour, potato starch, and other starchy powders, organic pigments, and organic powders such as cellulose. . Of the inorganic powders and organic powders exemplified above, particularly preferred ones may be used by mixing inorganic powders or organic powders together, or by mixing inorganic powders and organic powders. By appropriately mixing powders with different adsorption capacities, it is possible to obtain a penetrating liquid remover suitable for each liquid penetrant test.

The color of the penetrating liquid remover of the present invention is not particularly limited, and for example, a colorless to white color may be used.

The particle size of the powder used in the penetrating liquid remover of the present invention is 5 to 2.
Preferably, it is 0μ. The reason why the particle size is preferably in this range is that if the particle size is less than 5μ, the powder may enter the opening defect and absorb and remove the penetrating liquid in the opening defect, and if it exceeds 20μ, the powder may enter the opening defect. This is because the body may not be able to uniformly adsorb and remove the penetrating liquid on the surface of the subject. A particularly preferable particle size of the powder used in the penetrant remover of the present invention is about 10 μm.

[Embodiments of the Invention] A preferred embodiment of a liquid penetrant test using the penetrant remover of the present invention will be described in detail with reference to FIGS. 1a and 1b.

Cleaning the part to be inspected of the specimen where the presence of the opening defect 3 is assumed with steam, water or solvent,
Removes oil, fat, rust, etc.

After cleaning the surface, a dye or fluorescent paint or the like is dissolved in a paid solvent such as alcohol or benzene (5), and a penetrating liquid (2) in which some non-drying oil is dissolved is applied to the area.

After leaving it for an appropriate time, usually 5 to 30 minutes, so that the penetrating liquid 2 can sufficiently penetrate into the opening defect, organic powder such as wheat flour or inorganic powder 6 such as alumina with an average particle size of about 10 microns is poured. Distribute. The powder 6 is spread evenly over the entire surface of the area to which the penetrating liquid 2 has been applied, and after waiting for the powder 6 to sufficiently absorb the excess penetrating liquid, the powder is removed with a brush or the like or by suction. .

After the powder 6 is completely removed, a developer 5 made of, for example, powdered wax stone and suspended in higher alcohol is sprayed onto the area.

Apply developer evenly.

The higher alcohol evaporates, and the uniformly applied developer penetrates into the opening defect 3 and sucks out the remaining penetrating liquid 2, and the opening defect 3 appears.

Next, Table 2 lists the processing procedures of the liquid penetrant test method using the powder which is the penetrant remover of the present invention.

Table 2 As explained above, when the penetrant remover of the present invention is used, it is possible to remove the penetrant 2 more easily and effectively in a shorter time than with conventional methods. welded part,
Liquid penetrant testing can be applied to test objects 1 with complex shapes such as bolt threads and gears, and test objects 1 with rough surfaces.

[Effects of the Invention] As is clear from the above examples, when the penetrant remover of the present invention is used, opening defects can be easily and reliably removed even in specimens with rough surfaces or complex shapes. It produces an effect that can be grasped.

[Brief explanation of drawings]

FIG. 1a is a flowchart showing the processing procedure of a liquid penetrant test using the penetrant remover of the present invention, FIG. 1b is a cross-sectional view of a specimen subjected to a test using the penetrant remover of the present invention, and FIG. FIG. 2a is a flowchart showing the processing procedure of a conventional liquid penetrant test, and FIG. 2b is a cross-sectional view of an object to be subjected to a conventional test. 1...Object 2...Penetrant liquid 3...Opening defect 5...Developer 6...Powder (Permeate remover) Agent: Patent attorney Moritani-O Figure 2a Figure 2b

Claims (1)

[Scope of Claims] 1. A penetrant liquid removal agent for liquid penetrant testing, characterized by comprising an inorganic powder and/or an organic powder having the property of adsorbing a penetrant liquid. 2. The penetrating liquid remover for liquid penetrant testing according to claim 1, wherein the powder has a particle size of 5 to 20 μm.