The statement 'Magnetic particle testing can be done only on metals that can be magnetized' is:

The statement 'Magnetic particle testing can be done only on metals that can be magnetized' is:

• A. True
• B. False
• C. Only nonferrous metals
• D. It can be used on any metal

Answer: (A)

Magnetic particle testing relies on creating a magnetic field inside the part and watching for leakage fields at defects. Only metals that can be magnetized—typically ferromagnetic materials like iron, nickel, and cobalt alloys—will develop detectable flux leakage when a defect interrupts the magnetic path. If a metal cannot be magnetized effectively, no meaningful leakage field forms and the iron particles won’t accumulate at flaws, so defects aren’t revealed. That’s why the statement is true. Some metals that are not easily magnetized may require stronger magnetization, but the fundamental requirement is magnetization to make MT work.

Magnetic particle testing relies on creating a magnetic field inside the part and watching for leakage fields at defects. Only metals that can be magnetized—typically ferromagnetic materials like iron, nickel, and cobalt alloys—will develop detectable flux leakage when a defect interrupts the magnetic path. If a metal cannot be magnetized effectively, no meaningful leakage field forms and the iron particles won’t accumulate at flaws, so defects aren’t revealed. That’s why the statement is true. Some metals that are not easily magnetized may require stronger magnetization, but the fundamental requirement is magnetization to make MT work.