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Home » Authors » Charles J. Hellier

Charles J. Hellier

Charles J. Hellier, PE is the vice president of NDT Classroom Inc. For more information, email cjhellierIII@comcast.net or visit www.ndtclassroom.com.

Articles

ARTICLES

man scratching his head

NDT Terminology: Choosing Your Words Wisely

Help us clear up the confusion of NDT terminology.
Jeri Matza Charles J. Hellier
March 3, 2021
6 Comments

Effective communication only happens when the intended message is expressed successfully by one person and received and understood by another. If executed correctly, it cuts down the unintended consequences that arise as a result of miscommunication. 


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classroom scene

The Evolution of NDT Training

The need for training has always been essential to the growth of NDT
Charles J. Hellier
November 1, 2020
No Comments

The technology of nondestructive testing has experienced phenomenal growth over the past two decades and it is expected that this growth will continue for the foreseeable future. 


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radiographer

Radiographic Image Interpretation: Doing it Right

The process of radiographic interpretation consists of many variables with the major objective being achieving the highest possible quality level.
Charles J. Hellier
June 11, 2020
29 Comments

Radiographs have been interpreted since Wilhelm Conrad Roentgen first observed the X-ray of his wife’s hand back in 1896. The process of radiographic interpretation consists of many variables with the major objective being achieving the highest possible quality level or sensitivity.


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Fusion line crack

Magnetic Particle Testing 101: A Tutorial

Current codes, specifications and contracts usually require MT personnel to be certified.
Charles J. Hellier
October 1, 2018
No Comments

It is true that magnetic particle testing (MT) is one of the oldest NDT methods, and over the years has proven itself to be not only reliable, but cost effective, when it is applied properly with qualified personnel. 


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NDT Personnel Certification and Training: It’s Time to Do It Right

NDT Personnel Certification and Training: It’s Time to Do It Right

There are still far too many organizations involved with NDT not following the recommended practice or standards.
Charles J. Hellier
June 1, 2017
2 Comments

For decades in the United States, NDT personnel certification has been in a state of chaos. Since 1968, the basic certification program SNT-TC-1A, a “recommended practice” has been adopted and followed by many organizations.


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Radiographic Testing

Human Factors Affecting Disagreements Among Interpreters

In the second part of a two-part series, we look at factors affecting probability of detection.
R.R. Petrie Charles J. Hellier
November 1, 2016
No Comments

Radiographic testing (RT) techniques should be developed to achieve the highest image quality level achievable. 


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flaw detection

Variances and Human Factors in Radiographic Image Interpretation

As conventional film radiographic testing continues transitioning to the digital or computed RT process, the POD method of analysis is likely to improve significantly.
Charles J. Hellier R.R. Petrie
June 1, 2016
No Comments

All Nondestructive Evaluation (NDE) or examination methods comprise the following steps: the search for, and detection of the discontinuities, the indication or recording or signal–processing of those detected discontinuities, and the human interpretation of that indication, record or signal.


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Pie-Gauge

Magnetic Particle Testing Issues

There is a general lack of understanding of the basic MT principles.
Charles J. Hellier
April 1, 2016
2 Comments

This method has been proven to be one of the most reliable NDT methods for the detection of surface and near-surface discontinuities, as mentioned in an article “Key Elements of Magnetic Particle Testing” in the August 2015 issue of Quality. And even though it is a time-proven and accepted method, there are still cases of misuse and a general lack of understanding of the basic MT principles.


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MagneticParticle_FT

Key Elements of Magnetic Particle Testing

Magnetic particle examination is a very effective nondestructive examination method for the detection of surface and near surface discontinuities.
Charles J. Hellier
August 10, 2015
No Comments

Magnetic Particle Testing (MT), one of the oldest and most reliable NDT methods, is often not given the recognition it deserves.


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Back2Basics_FT
NDT WEB EXCLUSIVE

The Need for Quality NDT Training

NDT training is an essential foundation of personnel qualification.
Charles J. Hellier
November 4, 2014
One Comment

“The true measure of a successful NDT training program lies in the student’s ability to demonstrate that the body of knowledge was thoroughly comprehended and that the skills to effectively perform the nondestructive tests have been achieved. This should be the goal of all NDT courses.”


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