Magnetic Particle Testing (MT) endorsement: is it worth it?

The Magnetic Particle Testing (MT) endorsement extends a Certified Welding Inspector certification into a nondestructive examination method rather than a welding code. Where the D1.1 or ASME endorsements say you can apply a specific code, the MT endorsement says you can actually perform magnetic particle testing, the surface-flaw method, and document it. It is one of the two method endorsements on the matrix, alongside Penetrant Testing (PT), and it is priced and structured differently from the code endorsements because of that.

What magnetic particle testing actually covers

Magnetic particle testing detects surface and near-surface discontinuities in ferromagnetic material by magnetizing the part and applying iron particles that gather at the flux leakage a flaw creates. The AWS endorsement is written around the dry-powder yoke method, the portable field technique an inspector uses to check welds for cracks, laps, and other surface-breaking indications. It draws on the AWS Magnetic Particle (MT, Dry Powder Yoke Method) Book of Specification supplied at the exam, along with the underlying industry references such as ASTM E-709, the standard guide for magnetic particle testing, and the ASNT training material inspectors know from the NDE side of the trade.

Because MT only finds flaws that break or nearly break the surface, and only in magnetizable material, it is not a substitute for volumetric methods such as radiography or ultrasonics. Knowing that boundary is part of the competence the endorsement documents: MT for ferromagnetic surface flaws, PT for surface flaws in non-magnetic material, and volumetric methods for what is buried inside the weld.

Who needs the MT endorsement

The audience is any shop or agency that needs an inspector able to document surface-flaw NDE competence, not just perform a visual inspection. Fabricators whose contracts call for magnetic particle testing, third-party inspection agencies staffing multi-method jobs, and inspectors who want to broaden past visual work into NDE are the core. It pairs naturally with the PT endorsement, since together they cover surface-flaw detection in both magnetic and non-magnetic material.

Exam format, fee, and the practical

Unlike the open-book code endorsements, MT is a method endorsement: a written multiple-choice exam on magnetic particle testing practice plus a hands-on practical component performed at an accredited testing facility, so it verifies you can actually run the method, not only describe it. The exam fee is $505 for AWS members and $770 for non-members, higher than the $445/$540 code-endorsement tier.

There is one more cost the fee tables cannot pin down for you. The hands-on practical is administered by an independent Authorized Training Facility (ATF), and the ATF, not AWS, sets that practical fee, so it varies by facility and there is no single official number to quote. Budget for it as a separate line and contact the ATF you plan to test at for its current figure. The cost breakdown explains the same ATF-set-fee structure that applies to the base CWI Part B practical.

Using it as your recertification

A CWI certification is valid for nine years, and passing a new endorsement is one of the routes that satisfies that year-nine recertification when you take it within the eleven months before your certification expires. If you were going to add MT anyway and your recert deadline is near, timing it inside that window can fold two expenses into one. Run your dates through the recertification calculator to see whether the timing lines up, and confirm the recert credit with AWS when you register.

Who should add it, and who should skip it

Add MT if your work or your contracts call for documented magnetic particle testing, if you want to move from visual-only inspection into NDE, or if you want a new endorsement that doubles as your recert. Weigh the higher method-endorsement fee and the separate ATF practical cost carefully: if nothing in your work actually asks for MT, a code endorsement matched to your industry, such as D1.1 for structural steel or the ASME piping endorsement, is usually the better first buy. If you want surface-flaw coverage on non-magnetic material too, pair it with PT. Compare every option on the endorsement matrix, and use the endorsement recommender if you are unsure.