Liquid penetrant testing can be used to detect:

Liquid penetrant testing can be used to detect:

• A. Discontinuities not open to surface
• B. Discontinuities open to the surface
• C. Subsurface porosity that is not open to the surface
• D. Hidden cavities

Answer: (C)

Liquid penetrant testing reveals flaws that have a path to the surface. The penetrant enters through openings that reach the surface, and after removing excess and applying developer, the penetrant is drawn out at the flaw’s surface opening to create a visible indication. Because it relies on surface access, it can detect discontinuities that are open to the surface but cannot reliably detect defects that are completely below the surface or sealed off from the surface. So, the method is used to detect discontinuities that are open to the surface.

Liquid penetrant testing reveals flaws that have a path to the surface. The penetrant enters through openings that reach the surface, and after removing excess and applying developer, the penetrant is drawn out at the flaw’s surface opening to create a visible indication. Because it relies on surface access, it can detect discontinuities that are open to the surface but cannot reliably detect defects that are completely below the surface or sealed off from the surface. So, the method is used to detect discontinuities that are open to the surface.