Liquid Penetrant Testing : A Non-Destructive Testing Method for Surface Defect Detection (R)

𝗟𝗶𝗾𝘂𝗶𝗱 𝗣𝗲𝗻𝗲𝘁𝗿𝗮𝗻𝘁 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: 𝗔 𝗡𝗼𝗻-𝗗𝗲𝘀𝘁𝗿𝘂𝗰𝘁𝗶𝘃𝗲 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 𝗠𝗲𝘁𝗵𝗼𝗱 𝗳𝗼𝗿 𝗦𝘂𝗿𝗳𝗮𝗰𝗲 𝗗𝗲𝗳𝗲𝗰𝘁 𝗗𝗲𝘁𝗲𝗰𝘁𝗶𝗼𝗻

𝗣𝗿𝗼𝗰𝗲𝘀𝘀:

𝗦𝘂𝗿𝗳𝗮𝗰𝗲 𝗽𝗿𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻: Thorough cleaning of the surface is crucial to remove dirt, grease, paint, or other contaminants that could interfere with the test results.

𝗣𝗲𝗻𝗲𝘁𝗿𝗮𝗻𝘁 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻: A colored dye or fluorescent penetrant is applied to the surface, allowing it to seep into any surface defects through capillary action.

𝗣𝗲𝗻𝗲𝘁𝗿𝗮𝗻𝘁 𝗿𝗲𝗺𝗼𝘃𝗮𝗹: Excess penetrant is removed from the surface using solvent, lint-free cloth, or water, depending on the penetrant type.

𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻: A white, powdery developer is applied to the surface, which helps draw out the trapped penetrant from defects and spread it out, creating visible indications.

𝗜𝗻𝘀𝗽𝗲𝗰𝘁𝗶𝗼𝗻: The surface is visually inspected under appropriate lighting conditions. Indications or bleed-out patterns formed by the penetrant are examined for their size, shape, and other characteristics. The indications are wider than the actual defects, making them more easily noticeable.

𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗟𝗶𝗻𝗲𝘀:

Liquid penetrant testing can be performed manually, semi-automatically, or fully automated, depending on the specific requirements and available equipment. In some cases, penetrant examination is integrated into continuous-operation production lines, where samples undergo a series of steps within a timed cycle, including cleaning, penetrant application, removal of excess penetrant, developer application, and inspection.

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