Which statement best describes MT and PT testing in welding inspection?

Which statement best describes MT and PT testing in welding inspection?

• A. MT detects surface and near-surface discontinuities in ferromagnetic materials; PT detects surface-breaking defects by penetrant seeping into openings
• B. MT uses radiography to detect internal flaws; PT uses ultrasonic waves.
• C. MT measures magnetic field strength; PT measures conductivity.
• D. MT and PT are non-destructive surface coatings tests.

Answer: (A)

In nondestructive testing, Magnetic Particle Testing and Penetrant Testing are two methods that reveal surface-related flaws in different ways. Magnetic Particle Testing uses a magnetic field on a ferromagnetic part and applies magnetic tracers. When a defect disrupts the magnetic flux, the tracers gather at that area and form a visible indication, showing surface or just-below-surface discontinuities. This method specifically needs ferromagnetic material and is especially good for locating cracks, seams, and other near-surface flaws. Penetrant Testing relies on a liquid penetrant that wicks into any openings on the surface by capillary action. After removing excess penetrant, a developer draws the penetrant out of the defect to the surface, revealing a visible or fluorescent indication. This method detects only surface-breaking defects and works on many non-porous materials; it does not reveal subsurface flaws. So the statement that MT detects surface and near-surface discontinuities in ferromagnetic materials while PT detects surface-breaking defects by the penetrant seeping into openings captures what each method does best. The other options mix in radiography, ultrasonics, or unrelated measurements, which are not descriptions of MT and PT.

In nondestructive testing, Magnetic Particle Testing and Penetrant Testing are two methods that reveal surface-related flaws in different ways. Magnetic Particle Testing uses a magnetic field on a ferromagnetic part and applies magnetic tracers. When a defect disrupts the magnetic flux, the tracers gather at that area and form a visible indication, showing surface or just-below-surface discontinuities. This method specifically needs ferromagnetic material and is especially good for locating cracks, seams, and other near-surface flaws.

Penetrant Testing relies on a liquid penetrant that wicks into any openings on the surface by capillary action. After removing excess penetrant, a developer draws the penetrant out of the defect to the surface, revealing a visible or fluorescent indication. This method detects only surface-breaking defects and works on many non-porous materials; it does not reveal subsurface flaws.

So the statement that MT detects surface and near-surface discontinuities in ferromagnetic materials while PT detects surface-breaking defects by the penetrant seeping into openings captures what each method does best. The other options mix in radiography, ultrasonics, or unrelated measurements, which are not descriptions of MT and PT.