PT color detection

1.How it works:

A penetrant containing a colorant (usually red) is applied to the surface of the workpiece, and the penetrant will penetrate into the open defects on the surface. The excess penetrant on the surface is then removed, and a developer (usually white) is applied. The developer absorbs the penetrant in the defect, forming a clear red defect display against a white background, thereby determining the location, shape, and size of the defect.

2. Advantage:

（1）Detecting surface defects: It can effectively detect surface defects such as cracks (such as weld cracks and stress corrosion cracks), pores, pinholes, looseness, and incomplete weld penetration (surface openings) on carbon steel tee fittings. These defects can lead to fluid leakage, pressure loss, or structural failure.

（2）Ensuring safety: Tees are commonly used in pipeline systems, performing flow diversion or converging functions. Surface defects can expand under pressure, causing leaks or even explosions. PT testing can detect defects early and prevent safety accidents.

（3）Controlling product quality: During the pipe manufacturing process (such as forging and welding), PT testing can serve as a quality control point to determine process compliance (such as whether welding parameters are appropriate) and ensure that the product meets design standards.

（4）Widely applicable: It is not limited by workpiece shape and is particularly suitable for inspecting complex structures (such as corners and welds) on tee fittings. It also requires simple equipment (no large instrumentation required), flexible operation, and low cost.