DPCNEWS 072 - Solvent-based or non-aqueous wet developer? - Human factors - Coffee and corrosion inhibitor

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DPCNews
Written by Dubosc
Monday, 21 September 2015 17:03

In the front page this month | September - October - November 2015

[EDITO] Solvent-based developer or non-aqueous wet developer ?

[NEWS] Human Factors

[OLDIES BUT GOODIES] Coffee and corrosion inhibitor

[EDITO]

Solvent-based developer or non-aqueous wet developer ?

We have already devoted many editorials to the terminology used in penetrant testing (PT) and magnetic particle testing (MT). We always recommend that the authors of standards, specifications, training courses, multiple-choice questionnaires and any other document comply with the terminology, so that everyone can understand each other.However, even in strict accordance with the terminology standards, there is sometimes some kind of ambiguity.

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[NEWS]

Human Factors

We are happy to publish on our Website a paper by Richard GASSET, NADCAP Supplier Voting Member of Lisi Aerospace, which was published in the June 2012 PRI-NADCAP Non-Destructive Newsletter issue. It is known that 85 % of aircraft accidents have human causes. Could we imagine that 85 % of the defective parts that get the “Pass” tick after an NDT are accepted due to human errors? This paper fingers out very currently met situations…that, when added to each other, may make us think so!

We hope that this paper will be of some interest for you and bring you a top - quality information.

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[OLDIES BUT GOODIES]

Coffee and corrosion inhibitor

A very interesting-- and funny! – story!

In the late '70s - yes, again, old times! - a French company manufacturing new complex parts for high-performance engines asked for a PT process line. Tests showed that a then Level V water-washable penetrant (equivalent to today's Level 2 of the SAE-AMS 2644 American specification) without developer would be the right choice.

During the very first days, thousands of parts showed rust spots. A meeting with metal specialists made us understand that the washing water was the cause for the problem: when drying in an oven, it let small drops ("the last drop phenomenon") in curved areas, though the oven was ventilated.

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Last Updated ( Monday, 21 September 2015 17:40 )