Course Title:
Time of Flight Diffraction (ToFD) - Appreciation eLearning Package

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Suitable for:

The Time of Flight Diffraction Appreciation eLearning package brings the student into contact with ultrasonic testing even if the testing is conducted by someone else. This could be ultrasonic testing equipment vendors, auditors or supervisors – anyone who works indirectly with ultrasonic testing.

This eLearning package gives you 14 days’ access to the eLearning materials. The training is delivered step by step, one section at a time, but free of any time pressure to complete the individual modules.

Students completing the full package will be awarded a Certificate of Satisfactory Completion.

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Course Content:

The Time of Flight Diffraction Appreciation eLearning Package covers both manual and semi-automated PAUT and is divided in three modules:

Module 1:  Basic Principles of Ultrasound Testing

  • NDT, sound and ultrasound, basic notions, waves, dB system
  • Probes, wedges
  • Scans and views
  • UT production, wave propagation, coverage, techniques
  • Procedures and set-up
  • Calibration
  • Inspection and data management

Module 2: Principles Underlying Time of Flight Diffraction (ToFD)

  • Butt welds
  • Digital instrument, probes, wedges, scanners
  • Diffraction, refraction, pitch and catch technique
  • Beam spread, limitations
  • Type of scans, views, cursors
  • ToFD set-ups, essential variable
  • Pre-scanning calibration, beam index point, velocity
  • Scanning
  • Calibration of wedge delay, lateral wave removal and straightening

Module 3: Data Analysis

  • B-Scan perspective
  • Lateral wave, backwall and mode-converted backwall signals
  • Effect of beam spread on depth and the backwall signa
  • Indication classification, probe position vs. height, angle vs height
  • Geometrical indications, double-V welds, pipes misalignment, different wall thickness
  • Data quality, calibration, basic analysis, detailed analysis
  • Signal start, grouping, point-like indications
  • Height and depth, top-surface breaking, bottom-surface breaking, embedded
  • Length and position, parabolic shape, elongated and curved
  • Interactive defect viewer: top-surface breaking, bottom-surface breaking, embedded


Additional Information:

eLearning technical specificationsSo that your computer can run the ToFd eLearning modules you will need the following basic systems:

Operating System: Windows Vista 7, 8 or 10

Browser: Internet Explorer 11 or higher (PC)

Plugin: Silverlight Plug-in>You can get the Silverlight Plug-in using the following link:

Internet connection:2 MBIT/s

Please note: When you have booked your online training, you will receive an email notification with your login details.