The liquid penetrant examination method is used to detect surface defects in a weld.

The liquid penetrant examination method is used to detect surface defects in a weld.

• A. It does not reveal surface defects
• B. It reveals only subsurface defects
• C. It is a destructive testing method
• D. The liquid penetrant examination method is used to detect surface defects in a weld

Answer: (D)

Liquid penetrant testing detects flaws that open to the surface. It works by letting a liquid dye seep into surface openings, then drawing it out with a developer so defects appear as visible indications. Because it relies on flaws being connected to the surface, it does not reveal subsurface defects that do not reach the surface, and it is non-destructive. The statement that this method is used to detect surface defects in a weld is the correct description of what liquid penetrant testing does.

Liquid penetrant testing detects flaws that open to the surface. It works by letting a liquid dye seep into surface openings, then drawing it out with a developer so defects appear as visible indications. Because it relies on flaws being connected to the surface, it does not reveal subsurface defects that do not reach the surface, and it is non-destructive. The statement that this method is used to detect surface defects in a weld is the correct description of what liquid penetrant testing does.