Ultrasonic Thickness Testing


The Ultrasonic Thickness Testing course describes the basic principles of ultrasound as they apply to thickness testing of materials and components. It concentrates on the compressional wave mode (sometimes referred to as longitudinal or “straight beam”) and provides a straight forward way to apply this technique for precise thickness measurements. The various transducers used and their advantages are presented and demonstrated including straight beam, delay line, dual element (“pitch-catch”). Variables such as surface conditions, coatings, configuration, couplant and material grain structure are all addressed, and a wide range of applications are included.

This lesson also demonstrates how to calibrate UT Thickness instruments including Digital and A-scan, take actual measurements, and collect/document results. It is ideal for those individuals who will be taking thickness measurements with UT instruments and/or are pursuing Limited Level II UT Thickness certification. It is also applicable for those who will be providing oversight on UT Thickness operations.


This course meets the recommendations for training as described in SNT-TC-1A.

NOTE: The completion of these assignments in addition to self-study is strongly encouraged and will add to the overall training benefit and time to be credited. It will also better prepare the student for the practical lab/hands-on session. It is recommended that the student a log of the self-study time. It is also recommended that the applicable Level III be involved and confirm that the reading and self-study assignments have been completed. This should become a part of the student's training records which may be used in conjunction with subsequent certifications.


At a Glance



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Access to Course Materials

Course – 30 days
Exam – 10 more days


Course Length & Earnings

Approximately 14 hours

Course Details

  • Benefits
  • Course Modules
    Meets all ASNT ANSI SNT-TC-1A recommendations per CP-105. Students can typically retain 25% to 60% more of the information as compared to traditional classroom training.
    Participants can access the course 24/7 from any computer running Google Chrome browser with an internet connection.
    Pause to take notes with ability to retake lesson quizzes as needed. Online learning gives the student complete control over their learning experience.
    Audio/Video narration, demonstrations, animated graphics and video footage make even the most complex topics engaging and easy-to-understand.
    Detailed video demonstrations, practice problems, and quizzes facilitate the mastery of concepts and measure content retention.
    Course content was developed by Chuck Hellier with industry experts and NDT Classroom Inc. learning professional Kevin Crosby, Phd in curriculum design.
    Users can contact NDT Classroom instructors by emailing or calling 716-262-8870.
    NDT Classroom customer support Monday through Friday 8:30 AM to 5:00 PM EST. at or 716-262-8870
  • Chapter 1 – General Ultrasonic Theory
  • Chapter 2 – Equipment
  • Chapter 3 – Sound Properties and Wave Modes
  • Chapter 4 – Sound Travel, Couplant, Material Structure
  • Chapter 5 – Screen Presentation and Equipment Types
  • Chapter 6 – Transducers and Properties
  • Chapter 7 – Reference Standards, Calibration and Settings
  • Chapter 8 – Waveforms
  • Chapter 9 – Test Performance Variables
  • Chapter 10 – Qualification and Certification Requirements
  • Chapter 11 – Equipment Demo
  • Final Exam

Frequently Asked Questions

  • How much do I need to know before taking this course?

    You don’t need to have any background in NDT to take this course. It will prepare you to take the practical training needed to become certified by your employer.

  • Who should take this course?

    Anyone interested in expanding their welding career to examine welds and other types of materials and products.

  • How long do I have to complete this course?

    You have 30 days to take the course and 10 days to complete the exam.

  • Does this course include a completion exam?

    Yes, you will not only take quizzes after many of the chapters, there is a final exam after the successfully complete the course.

  • Do I need to purchase any other materials?

    We recommend you use the ASNT classroom Guide Book Item Number: 1642.

  • Does the time I spend in this course count towards the recommended number of training hours per ASNT SNT-TC-1A?

    Yes, all of the time you spend in the course, any reading time and hands on practical training all count towards the recommended number of training hours.

  • Can I use these hours for recertification?

    Yes, you can use this time towards your recertification.

  • What platforms and devices can I use to view the courses?

    You must be connected to the internet to access our online courses. We support the most recent versions of Google Chrome, Firefox, Safari, and Internet Explorer. Courses can be viewed on desktops, laptops, tablets, and mobile phones. Note, however, that a high speed internet connection and large screen offer a better user experience.





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