No mention of MT testing in ASM Handbook Vol 15 - castings - Nondestructive Evaluation

[Tmoose]

I have a hard copy of the Handbook, 2008 Edition.

Online view of the Table of contents here -

https://www.asminternational.org/do...tter.pdf/072c07a8-92aa-4292-9b64-5270916d751b

The body of the text is just like the online preview Table Of Contents shows.
LP but no MT.

Nondestructive Testing of Components . . . . . . ............. 1174
Liquid Penetrant Inspection........................ 1174
Radiographic Inspection . . ........................ 1174
Fluoroscopic Inspection and Automated
Defect Recognition . . ........................ 1174
Ultrasonic Inspection . . . . ........................ 1174
Eddy Current Inspection . . ........................ 1175
Process-Controlled Resonant Testing (Contributed by
Quasar International, Inc.) . .................... 1175
Leak Test . . . . . ............................... 1177
Electrical Conductivity Measurement . . . . ............. 1177

I'm wondering if the omission of Mag Particle Testing (MT) was an oversite, or possibly an actual hint that MT testing has drawbacks that make it not particularly suitable for ferrous castings. Neither explanation is very satisfactory or professional in my opinion.

Does anyone have insight or insider knowledge of the real explanation ?

thanks,

Dan T

 

[metengr]

There is MT mentioned in Volume 15, in a different location;

Repair Welding of Ferrous Castings

Verification of Weld Repair Quality. Typical nondestructive test methods, such as visual inspection (VT), magnetic particle inspection (MT), liquid particle inspection (PT), radiographic inspection (RT), and ultrasonic inspection (UT), to name a few can be used to determine the quality of the finished weld repairs. The test method, inspection procedure, acceptance criteria, and test personnel requirements are typically specified in the governing code (or standard), project specifications, or contract requirements.

I would not read too much into the exclusion of MT in this part of Volume 15.

 

[ledon]

As metengr stated, MT is better for local area and repair. A complex casting can present many problems that would be difficult to overcome in a 100% Volumetric inspection. Magnetic writing at fillets and thickness transitions, gauss saturation in thinner areas, etc.