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 color in the photo below (detailed information section) is a sample.
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basic information
The red substance in the title photo is a liquid that combines red dye 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 before being removed. Next, as shown in the lower photo (details 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 cracks is drawn out by the capillary action 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 against this white background, creating a very clear contrast between the white and red, making the cracks easily visible to the naked eye. There are several methods for this test, 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), allowing for a combination of methods suitable for the test object and inspection environment.
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Applications/Examples of results
The penetrant testing examines surface-opened defects, so in welded pipe fittings, it is often used to test the beveling at the pipe ends (the machined area for butt joints) 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 surfaces of the fitting, including the inner surface, outer surface, and bevel area. We can accommodate all of these, so please feel free to consult with us.
Detailed information
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This is the pipe end PT test. A penetrant is applied and 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 specimen. This is a specimen 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 halves for color development, allowing for comparative analysis.
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Color development section (Color development test of welded parts) This is a sample of PT test color development, where cracks were intentionally created in the welded tab plate test piece to induce color development.
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From residential water supply and hot water piping to massive pipelines in large-scale plants, piping that supports our daily lives is spread throughout the world. Benkan Kiko Co., Ltd. is involved in the manufacturing of welded pipe fittings, which are essential components of this piping. We provide optimal products tailored to the piping environment (design and usage conditions, etc.) and construction situations, not only for general building water supply and hot water piping but also for power plants, gas plants, refineries, oil and chemical plants, shipbuilding, and more, where strict quality standards are required.