How to use dye penetrant testing agent correctly? Color penetrant testing agent is a very common detection method, mainly used for detecting surface open defects that endanger the service life of metal and non-metal materials and the safety of pressure vessels, such as welding cracks, fatigue cracks, stress corrosion cracks, grinding cracks, quenching cracks, etc. It has unique advantages of sensitivity, rapid conclusion, good repeatability and intuitiveness.

Instructions for using dye penetrant testing agent:

1. Surface preparation and pre cleaning: Surface preparation mainly refers to the surface cleaning of parts before penetration inspection, including the steps of cleaning iron filings, rust, burrs, oxide scales, carbon deposits, etc. Pre cleaning is a process of penetration inspection, mainly used to remove surface pollution such as oil stains on the surface of parts. The necessity of removing all surface contaminants before penetration testing:

1) The oil stains on the surface of the parts carried into the penetrant tank will contaminate the penetrant, reduce the luminescence intensity or color intensity of the penetrant, and decrease the penetrant's penetration ability and service life.

2) Penetrating agents are prone to remain in areas with oil stains on parts, which may mask defects in these areas.

3) The penetrating agent infiltrates but mixes with the oil stains in the defect, causing a decrease in the fluorescence brightness or color intensity displayed.

4) Penetrating agents are prone to retaining burrs, oxide scales, and other areas on parts, resulting in false displays.

5) Prevent the penetration agent from penetrating into the defect, and even block the defect.

2. Penetration: The main function of penetration is to cover parts with a penetrant. Currently, methods such as spraying, brushing, flow coating, electrostatic spraying, or immersion coating can be used. In practical operation, the appropriate method should be selected according to the size, shape, quantity, and inspection site of the parts. However, regardless of which method is used, it is necessary to ensure that the inspected site is completely covered by the penetrant and kept moist throughout the entire penetration time.

3. Removing excess penetrant on the surface: In practical operation, removing excess penetrant on the surface requires the user to remove all penetrant from the surface of the part, without cleaning the penetrant that has penetrated into the defect, in order to ensure the highest inspection sensitivity under the premise of qualified background.

4. Drying: For parts that are cleaned with water, when performing dry powder imaging or non water wet imaging, they need to be dried. If using water wet imaging, they can be directly imaged after washing with water and then dried. For solvent removal methods, there is no need for specialized drying treatment.

5. Imaging: After the parts are dried, imaging should be carried out immediately. The imaging process involves extracting penetrant from the defects. The method can be to use a powder coating cabinet for powder coating imaging. During powder coating imaging, the parts are placed in the powder cabinet and the imaging powder is blown up with filtered, clean, and dry compressed air or a fan to form a powder mist, surrounding the parts and evenly covering them with a layer of imaging powder.

6. Inspection: The final step is color inspection, during which the white light intensity must be sufficient. At the same time, to ensure the inspection of minor defects, the ear illumination on the inspected part should reach at least 1000 lux.

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