A help to choose the most suitable technique

Misconceptions within magnetic testing

February 2012

This document is based on a conference given by George HOPMAN, in Las Vegas, on 13 November 2007.
It is important to know a bit more about this man, well known - and renowned - in the American NDT world. You may find his résumé at the end of this paper.

Time goes by and some things may have changed since this conference. What we wish here is to show "the critical thinking" we all of us shall continuously have: this is not always because one does "according to the relevant standards or documents" that one shall perform a successful inspection, i.e. finding the discontinuities that must be detected.

MT magnetizing techniques

January 2012

We have the pleasure to publish on our Website a contribution by a French MT expert, Stéphane GRAVELEAU, from the R and D Department of SREM TECHNOLOGIES (France).

Magnetizing techniques and current waveforms are described.
Very often, the wave forms displayed in training courses, even in standards, are those got on weakly inductive loads. As this paper explains, on highly inductive loads, the curves do not have the form that one would expect.
In fact, waveforms are very dependent on the electric characteristics of the load.

Effluent treatment in MT

July/August 2011

1- Introduction

MT effluents are less problem-prone than effluents from PT lines.

Chemical formula and how MT products are used are the main points.

This topic was dealt with in a conference(*) given by one of us, and this paper is an update.

Low frequency magnetic fields and exposure of users

March 2011

By Stéphane GRAVELEAU, Research & Development Department, SREM TECHNOLOGIES (France)
Edited by Pierre CHEMIN and Patrick DUBOSC

Though this paper is a kind of answer to an article (1) published in the French technical journal MESURES, issued in January 2011, we think it will be valuable for all those involved in Magnetic Testing, users, managers and equipment manufacturers. The paper published in Mesures gives disputable pieces of information, either from the technical or from the medical point of view.