Basic principle of liquid penetrant testing: After the surface of a part is coated with a penetrant containing fluorescent or dye dyes, under the action of a capillary tube, after a period of time, the penetrant can penetrate into the surface opening defects; After removing the excess penetrant on the surface of the part, a developer is applied to the surface of the part. Similarly, under the action of a capillary, the developer will attract the retained penetrant in the defect, and the penetrant will seep back into the developer. Under a certain light source (ultraviolet or white light), the traces of the penetrant at the defect are realized (yellow green fluorescence or bright red), thereby detecting the morphology and distribution status of the defect.

Advantages of penetrant testing:

a. It can detect various materials, including metallic and non-metallic materials; Magnetic and non magnetic materials; Welding, forging, rolling and other processing methods;

b. Has high sensitivity (can be found to be 0.1 μ M width defect);

c. Intuitive display, convenient operation, and low detection cost.

Disadvantages and limitations of penetrant testing:

a. It can only detect defects with surface openings;

b. Not suitable for inspecting workpieces made of porous and loose materials and workpieces with rough surfaces;

c. Penetrant testing can only detect the surface distribution of defects, making it difficult to determine the actual depth of defects, making it difficult to quantitatively evaluate defects. The detection results are also greatly influenced by the operator.

Artison is a supplier of aerospace components; Products include impeller, turbine, combustion chamber, fastener, etc.

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