Basics (1)

Question 1

Advantages of MT

Answer 1

• Locates fine, shallow surface cracks
• Defects at surface or slightly subsurface
• Fast and simple
• Very little size and shape limitations
• inexpensive

Question 2

Disadvantages of MT

Answer 2

• Test material must be Ferromagnetic
• Orientation and strength of magnetic field is crucial
• High current may be necessary
• Some parts require demagnetization
• Materials can be burned by too high of a current

Question 3

What is Magnetic Particle Testing?

Answer 3

NDT method that uses magnetic fields and small magnetic particles to test for surface or slightly subsurface defects.
- particles are attracted to field leakage sites (defects)

Question 4

Magnetic Particle Testing particles can be in a dry powder form or _____________.

Answer 4

suspended in oil or water.

Question 5

Why would MT be chosen over LPI?

Answer 5

Faster, requires less surface prep and is able to locate slightly subsurface flaws.