Liquid Penetrant Testing inspection is a nondestructive testing method of revealing discontinuities that are open to the surfaces of solid and essentially nonporous materials. Indications of a wide spectrum of flaw sizes can be found regardless of the configuration of the work piece and regardless of flaw orientations. Liquid penetrants seep into various types of minute surface openings by capillary action. Because of this, the process is well suited to the detection of all types of surface defects such as:
- Cracks
- Seams
- Porosity
- Laps
- Laminations
- Cold Shuts
Liquid Penetrant Testing is extensively used for the evaluation of wrought and cast products of both ferrous and nonferrous metals, power metallurgy parts, ceramics,
plastics, and glass objects. Because of the vast differences among applications for penetrant inspection, two types of penetrants (Type I, fluorescent, and Type II, visible) are used.
Liquid dye penetrant is a perfect method for examining for stress-corrosion and fatigue cracks that are insidious, usually there is very little or no warning of their presence. This is why it is very important to provide early detection on such structures as cranes, bridges, vessels, piping, where there is risk of possible hard economic consequences and loss of lives. |
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