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DPCNews 073 : Sensitivity or ability to detect discontinuities of the MT detection media - PT and MT chemicals packaging - The laws of chance - Thixotropic magnetic inks?

Written by Dubosc
Thursday, 10 December 2015 11:57

In the front page  | December 2015 - January - February 2016

[EDITO] Sensitivity or ability to detect discontinuities of the MT detection media

[NEWS] PT and MT chemicals packaging

[OLDIES BUT GOODIES] The laws of chance

[MAIL INBOX] Thixotropic magnetic inks?



MT detection media: Should we talk about their detection sensitivity or their ability to detect discontinuities?

The penetrant systems (product families) are qualified after determining their sensitivity levels according to the ISO 3452-2 standard, when using the Type 1 reference blocks of the ISO 3452-3 standard. They may also be qualified according to the SAE-AMS 2644 American specification. It is, therefore possible to use the word “sensitivity” for the penetrant systems (product families). As for the magnetic particle testing, the ISO 9934-2 standard, as well as the ASTM E1444 / E1444M – 12 standard, do not state any test method to characterize the sensitivity of detection media (also called “examination media”), and there is neither any kind of reference test panel, nor any reference detection medium that would allow for the evaluation of the sensitivity of the detection media and for ranking them by sensitivity levels, as is the case with PT materials. Some thoughts about the MT detection media.

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PT and MT chemicals packaging

Few problems are faced by users when processing Penetrant Testing (PT) and Magnetic Particle Testing (MT) materials packed in cans.This is true for penetrants, solvent cleaners/removers, water-soluble developers and ready-to-use oil-based magnetic inks. On the other hand, some troubles may occur with the other chemicals, such as…

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The Law of chance

In the '90s, a marine engines manufacturer/MRO (maintenance, repair and overhaul) purchased a complete set of MT equipment. Among different devices, a digital tangential magnetic-field meter was supplied. After close to two years in-service, both the Hall probe and its cable were damaged; the tangential magnetic -field meter was unusable. A new probe-and-cable set was due, and the entire unit would need a recalibration.

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December 2015 : Thixotropic magnetic inks ?

Having to perform an MT inspection above his head, on an overhead structure, one of our readers wondered whether thixotropic detecting media exist for this method. It seems that no thixotropic detecting medium exists. May we find why?

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Last Updated ( Thursday, 10 December 2015 12:11 )