Welded pipe fittings for plants - PT test
For the quality of welded pipe fittings (welded joints), trust Benkan Kiko.
The photo shows the PT test (penetrant testing) being conducted on welded pipe fittings. Penetrant testing is a type of non-destructive testing that is performed without causing physical damage to the product or test piece, and it is used to detect defects that are difficult to see visually on the surface of the product. (This testing method only targets the detection of surface-open defects.) *The coloration in the photo below (detailed information section) is a sample.
basic information
The red substance in the title photo is a liquid that consists of a red dye mixed with an oil-based penetrant known as a penetrant solution. This liquid is very fluid and has high penetrability, allowing it to seep into fine gaps, such as cracks in the test object, through the principle of capillary action. The penetrant solution is applied to the test object and left for a specified period, after which the penetrant is removed. Next, as shown in the lower photo (detailed information section), a solvent-based spray containing very fine white particles known as a developer is applied to the test object. This time, the penetrant that had seeped into the flaws is drawn out by capillary action into the spaces between the fine particles of the developer. Since the surface of the test object becomes white due to the developer, the red penetrant is drawn out onto this white surface, creating a very clear contrast between white and red, making the flaws easily visible to the naked eye. There are several methods for this testing, including different types of penetrants (dye, fluorescent types), methods for removing the penetrant (solvent removal, water washing), and types of developers (wet, dry, fast-drying), and the appropriate method is selected based on the test object and inspection environment.
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Applications/Examples of results
The penetrant testing examines surface-opened defects, so in the case of welded pipe fittings, it is often used primarily for testing the beveling of pipe ends (the machined area for butt welding) and the longitudinal weld seams during the manufacturing of large-diameter fittings. As shown in the title photo, it is also possible to test all areas of the fitting, including the inner surface, outer surface, and bevel. We can accommodate all of these, so please feel free to consult us.
Detailed information
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End pipe testing This is the state of the end pipe PT test. A penetrant has been applied and is left for a certain period of time.
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Application of developer This shows the process of applying the developer.
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Contrast test piece. This is a test piece that has been pre-treated to induce surface cracking for the purpose of comparing and testing the color development of PT. It is divided in half at the center, and different penetrants are applied to both test pieces for color development, allowing for comparative analysis.
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Color development section (Color development test of the weld area) This is a sample of PT test color development, where cracks were intentionally created in the welded tab plate specimen to induce color development.
