How Do You Test Liquid Penetrant

The principle of liquid penetrant testing is that the liquid penetrant is drawn into the surface-breaking crack by capillary action and excess surface penetrant is then removed; a developer (typically a dry powder) is then applied to the surface, to draw out the penetrant in the crack and produce a surface indication.

What is the purpose of liquid penetrant test?

Liquid penetrant testing is a nondestructive material examination procedure used to check for deficiencies such as cracks by spreading a thin liquid dye onto the material’s surface, followed by the application of a developer.

What is the disadvantage of liquid penetrant test?

Liquid penetrant testing has the following disadvantages: Extensive, time-taking pre-cleaning critical—surface contaminants can mask defects. Sensitive to surface-breaking defects only. Direct connection to the surface under test necessary.