Read TNT Online

ASNT Publications. ASNT Logo. ASNT... Creating a Safer World!

ASNT 2021. The Annual Conference. Where the NDT world comes together.

March–April 2022

Welcome to the The NDT Technician (TNT) newsletter! In this bimonthly email, we’ll round up the latest news and resources especially curated for the NDT inspector. Have a suggestion or feedback? Contact the editor Jill Ross at  

What Would You Do? An Ethical Scenario

Pathways from NDT Level II

to Level III 

Are you interested in someday becoming a Level III? There are many possible pathways that can lead to this goal. This article provides a general guideline to the skills and competencies that are needed to become a successful Level III. 


Read More

Bonus: Want to learn more? View the on-demand webinar “Responsible Level 3 Duties and Authorities per

NAS 410” presented by Toni Bailey, owner of TB3 NDT Consulting LLC.


Watch Now

What Would You Do?

An Ethical Scenario

A new column in Materials Evaluation presents an ethics scenario regarding the validation and documentation of work experience for initial NDT qualification, along with examples of potentially unethical behavior when proving the validity of documentation.


Click the button below to join the discussion!


Read More

Ecutec Ad

The NDT Technician. ASNT Members Discuss Enhancing CWI Credential

ASNT Pulse Blog.  A Deep Dive into Underwater NDT.

ASNT Members Discuss Enhancing CWI Credential

This article from AWS features interviews with three ASNT NDT Level IIIs:

James Bowen; John Chen, PhD, who is ASNT Secretary/Treasurer and Technical Editor of Materials Evaluation; and Ricky Morgan, who is an ASNT Past President and current member of the Technicians Advisory Committee. In the article they discuss ASNT certifications that enhance the CWI credential. 


Read More

A Deep Dive

into Underwater NDT

In this episode of Chat NDT with ASNT, Josh de Monbrun, chair of ASNT’s Underwater NDT Committee, talks about the current methods and technologies used in underwater NDT, different paths to becoming an underwater inspector, and the future of the industry.


Read More

Flawtech Advertisement

Free On-Demand Webinar on TFM/FMC with ASNT Learn.

ASNT Learn

Free On-Demand Webinar


Learn more about the total focusing method (TFM) and full matrix capture (FMC) in this free on-demand webinar! Alan Caulder, vice president of sales at Advanced OEM Solutions/The Phased Array Co., explains the basics of TFM/FMC, including the synthetic aperture focusing technique, half matrix capture, and plane wave imaging, as well as an overview of the recent advancements in TFM and FMC techniques.


Watch Now

Verifying Exotic Materials

Using XRF

Modern X-ray fluorescence spectroscopy (XRF) instruments and software can easily characterize common alloys; however, less common alloys, such as nickel superalloys and uraniums, present a greater analytical hurdle. This article explains how standardization adjustments through software improvements can increase testing accuracy for these uncommon alloys.


Learn More

Looking for a Previously Published ASNT Article?

The NDT Technician. Visit

Looking for a Previously

Published Article?

Check out the updated TNT index of articles! This PDF is a handy reference to download and keep on your desktop. In addition, all back issues of TNT are archived online—including this new email format! You can also search the NDT Library by keyword.


TNT Index


In Case You Missed It

Have you visited lately? The website offers a wealth of recently updated information on the history, physics, techniques, and engineering of nondestructive evaluation. The site was renovated and updated in 2021 by Iowa State University with support from ASNT and the National Science Foundation.



Tech Tip: PT Pretesting Procedure for Nonmetallic Parts

Tech Tip: PT Pretesting Procedure for Nonmetallic Parts

Materials used in PT contain petroleum oils, solvents, and wetting agents. These oils, solvents, and wetting agents may react with certain nonmetallic materials such as some types of plastic, rubber, and plexiglass. They can cause the surfaces of such materials to swell, craze, soften, or distort. Pretesting of nonmetallic parts prior to PT reduces the possibility of surface damage. Pretesting is not required if parts of the same materials have been previously inspected by the penetrant method and were not damaged.


Pretesting can be accomplished as follows:

  1. If spare or extra parts are available, the entire part can be pretested. If the part to be inspected must be reused, only a small area in a location where possible damage can be tolerated should be pretested.
  2. The part to be pretested should be cleaned and the surface closely examined for evidence of preexisting damage.
  3. Apply the penetrant to be used to the area selected for pretesting and allow it to dwell for at least 2× the proposed penetrant dwell time. After the dwell time, wipe off the penetrant and examine the part for any surface changes.
  4. Repeat step 3 with the emulsifier/remover and then with the developer to be used. Allow each step to dwell for at least twice the proposed dwell time for each material and closely examine the surface for any changes after each process step.
  5. If there is any evidence of surface change after any of the process steps, the penetrant method should not be used.
  6. Some materials may only show surface changes after they have been subjected to extended service conditions (such as aging, cold, heat, and moisture). Pretesting will not detect delayed surface changes that may occur after the part has been subjected to service conditions.

Shop the ASNT Store for Principles and Applications of Liquid Penetrant Testing: A Classroom Training Text

This Tech Tip is excerpted from Principles and Applications of Liquid Penetrant Testing: A Classroom Training Text, which is now available as an ebook. Packed with new photographs, updated standards, practices, and references, this revised edition of the popular PT reference was created as a classroom training book or for the working technician to use every day. 



If you liked this issue of TNT, please share with a colleague.

Follow ASNT on Social Media

Link to ASNT Instagram PageLink to ASNT LinkedIn PageLink to ASNT Facebook PageLink to ASNT TwitterPodcast IconASNT Pulse Blog

Blog  |  Website  |  Store  |  Privacy Policy  |  Terms

You're receiving this message from ASNT Publications.

1711 Arlingate Lane, Columbus, Ohio 43228