Liquid penetrant inspection can be used only on nonmagnetic metals.

Liquid penetrant inspection can be used only on nonmagnetic metals.

• A. True
• B. False
• C. Only on ferromagnetic metals
• D. It requires magnetic field

Answer: (B)

Liquid penetrant testing detects surface-breaking flaws by letting a dye or fluorescent penetrant seep into openings and then revealing it with a developer. It does not rely on magnetic properties, so it can be used on both ferromagnetic and nonmagnetic materials, as long as the surface is clean and accessible. That's why the statement is not correct. Magnetic field-based methods, like magnetic particle testing, are a different technique. Remember, LPI mainly finds surface-breaking flaws and can be affected by surface conditions, coatings, or roughness.

Liquid penetrant testing detects surface-breaking flaws by letting a dye or fluorescent penetrant seep into openings and then revealing it with a developer. It does not rely on magnetic properties, so it can be used on both ferromagnetic and nonmagnetic materials, as long as the surface is clean and accessible. That's why the statement is not correct. Magnetic field-based methods, like magnetic particle testing, are a different technique. Remember, LPI mainly finds surface-breaking flaws and can be affected by surface conditions, coatings, or roughness.