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Anonymous users2024-02-11The method of infiltrating the gap of the surface opening defect with yellow-green fluorescent permeate or colored non-fluorescent permeate, removing the excess permeate on the surface after cleaning, and then showing the existence of defects through imaging is called penetrant flaw detection.
The working principle of penetrant flaw detection is that after the permeate containing fluorescent dyes or coloring dyes is applied to the surface of the part, the permeate can penetrate into the surface opening defects after a certain period of penetration under the action of capillaries. After removing the excess permeate and drying on the surface of the part, the adsorption medium - developer is applied on the surface of the part; The developer will adsorb the permeate in the defect.
Under a certain light source (trapped light or white light), traces of permeate at the defect are displayed (yellow-green fluorescence or vivid red), thus detecting the shape and distribution of the defect.
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Anonymous users2024-02-10Upstairs is very good, add the basic operation of penetrant flaw detection: preparation of the surface of the workpiece (the roughness caused by grinding meets the requirements, and the metallic luster is very important) - cleaning agent to clean the surface of the workpiece (it can also be washed with water to save costs) - apply penetrant (there are spraying, brushing, dipping, and pouring) - remove excess penetrant (note: can only be wiped in one direction, can not be wiped back and forth, and the workpiece cannot be sprayed directly with cleaning agent) - drying (natural drying) - applying developer (note:
Angle 30-40, distance 300-400, keep film-like, shake well before use, )-Observe and record.
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Anonymous users2024-02-09Penetrant testing is a non-destructive testing that uses the principle of capillary action to detect open defects on the surface of materials.
Method. Scope of application:
1. Testing (steel, heat-resistant alloy, aluminum alloy, magnesium alloy.)
Copper alloys) and non-metallic (ceramic, plastic) workpieces with surface opening defects, such as cracks, porosity, porosity, slag inclusions, cold separation, folding, and oxidation scars. These surface opening defects, especially subtle surface opening defects, are generally difficult to detect with direct visual inspection.
2. Magnetic materials can be inspected and non-magnetic materials can also be inspected; Ferrous metals can be inspected.
Non-ferrous metals can also be inspected, and non-metals can also be inspected.
3. You can inspect welded parts or castings, rolled parts and forgings, and machined parts.
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Anonymous users2024-02-08Penetrant flaw detection (PT).
Principle: After the penetrant containing fluorescent dyes or coloring dyes is applied to the surface surface of the part, the permeate can penetrate into the surface opening defect after a period of time under the action of the capillary; After removing the excess permeate on the surface of the part, the developer is applied to the surface of the part, and similarly, under the action of the capillary, the developer will attract the permeate retained in the defect, and the permeate will infiltrate back into the developer, and under a certain light source (ultraviolet light or white light), the traces of the permeate at the defect will be realized, (yellow-green fluorescence or bright red), so as to detect the morphology and distribution state of the defect.
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Anonymous users2024-02-07The advantages of penetration flaw detection are: 1. The defect display is intuitive;
2. High sensitivity;
3. The inspection is not affected by the geometry of the workpiece and the direction of the defect;
4. No water and electricity, especially suitable for on-site inspection.
The disadvantages of penetrant testing are: 1. The nature of the defect can only be roughly determined.
2. The detection speed is relatively slow.
3. The pollution is relatively heavy.
Penetrant testing is suitable for the detection of surface opening defects in any non-hollow material workpiece, including cracks, white spots, porosity, pinholes and inclusions.
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Anonymous users2024-02-06Advantages: It can detect a variety of materials; metallic and non-metallic materials; magnetic, non-magnetic materials; welding, forging, rolling and other processing methods;
High sensitivity (wide defects can be found);
The display is intuitive, the operation is convenient, and the detection cost is low.
Disadvantages: It can only detect defects in surface openings;
It is not suitable for inspecting workpieces made of porous porous porous materials and workpieces with rough surfaces;
Penetrant testing can only detect the surface distribution of defects, and it is difficult to determine the actual depth of defects, so it is difficult to make quantitative evaluation of defects. The detection results are also greatly influenced by the operator.
Detection for what kind of situation:
It is suitable for inspecting workpieces made of non-porous and loose materials.
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Anonymous users2024-02-05Answers]: a, c, d
This question is a non-destructive test for Huaihuai. The advantage of penetrant flaw testing is that it is not limited by the geometry, size, chemical composition and internal structure of the test piece, nor is it limited by the direction of the defect, and all defects in the surface can be inspected at the same time in one operation; There is no need for particularly expensive and complex electronic devices and instruments; The speed of inspection is fast and high, the operation is relatively simple, a large number of parts can be inspected in batches at the same time, the defect display is intuitive, the inspection sensitivity is high, the operation is simple and does not require complex equipment, the cost is low, the defect display is intuitive, it has a fairly high sensitivity, and the defect can be found with a width of 1 m to tremble.
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Anonymous users2024-02-04Penetrant testing is to place a dye containing it.
The coloring or fluorescent penetrant is applied to the surface of the part, acting in capillaries.
Below, due to the wetting of the liquid and the capillary action, the penetrant penetrates into the surface opening defects. Excess penetrant is then removed from the surface of the part and a thin layer of developer is applied to the surface of the part. The penetrant in the defect is re-adsorbed to the surface of the part under the action of capillaries, resulting in an enlarged defect image shown in a black light.
Fluorescence test) or white light (coloration test) to observe the defect display.
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Anonymous users2024-02-03Answer]: A, crack carry difference B
Penetrant flaw testing consists of four basic steps: infiltration, cleaning, imaging and inspection. The advantage of penetrant testing is that it is not limited by the geometry, size, chemical composition, internal structure and defect orientation of the test piece, and all defects in the surface can be inspected at the same time in one operation; The speed of inspection is fast, a large number of parts can be inspected in batches at the same time, the defects are displayed intuitively, the inspection is sensitive, the operation is simple, no complex equipment is required, the cost is low, and the defects with a width of less than 1 m can be found. It can detect defects such as cracks, inclusions, looseness, folding, and porosity; Not suitable for loose and porous materials.
The main limitation is that only the defects that are open on the surface of the specimen can be detected, but the depth of the defects and the shape and size of the defects inside cannot be displayed.
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Anonymous users2024-02-02It is a non-destructive testing method based on the principle of capillary action to inspect surface opening defects.
Capillary action refers to the phenomenon that the infiltrated liquid rises in the thin tube and the non-infiltrated liquid decreases in the thin tube. Among them, the duct in the stem of the plant is the very fine capillary in the plant, which can absorb the water in the soil, and the bricks absorb water, the towel absorbs sweat, and the pen absorbs ink. There are many tiny pores in these objects that act as capillaries, and the combined effect of the surface tension, cohesion and adhesion of the liquid allows the moisture to rise to a certain height in the smaller diameter capillaries, which is called the capillary phenomenon.
The working principle of penetrant testing is as follows: after the surface of the workpiece is coated with a penetrant containing fluorescent dyes or coloring dyes, under the action of capillaries, after a certain period of time, the penetrant can penetrate into the surface opening defects; Remove the excess penetrant on the working surface, and after drying, apply the adsorption medium - developer on the surface of the workpiece; Also under capillary action, the developer will attract the penetrant in the defect, that is, the penetrant will infiltrate back into the development; Under a certain light source (black or white light), the traces of penetrant at the defect are displayed (yellow-green fluorescent or bright red), so as to detect the topography and distribution of the defect.
Hehe, I love it when someone asks me a question.
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