Answer:
Can be used-
surface cracks, porosity, laps, seams, lack of fusion, etc.).
cannot be used-
Porous materials like concrete, cloth, wood, paper, and some types of fibreglass
Step-by-step explanation:
WHY CAN BE INSPECTED-/-
Materials that are commonly inspected using this method include; metals, glass, many ceramic materials, rubber and plastics. However, liquid penetrant testing can only be used to inspect for flaws that break the surface of the sample
WHY CANNOT BE INSPECTED-/-
if the fibres are visible on the surface should not be tested using this technique. The first step of liquid penetrant testing is surface preparation that is one of the most important steps.