What is Ultrasonic TOFD?

Time of Flight Diffraction is an Ultrasonic technique developed originally to improve the sizing accuracy of flaws previously detected by other means. Early applications of the technique advanced from solely sizing flaws to applications relying on TOFD for principle detection means, this pioneering technology resulted in major flaws being missed due to poor application and a general lack of understanding by persons operating the equipment.

What are the responsibilities of an individual who is certified to UT TOFD Level 2?

An individual certified to UT TOFD Level 2 has demonstrated competence to perform NDT according to UT TOFD procedures. Within the scope of the competence defined on the certificate, Level 2 personnel may be authorised by the employer to:

  • Select the UT TOFD technique for the test method to be used;
  • Define the limitations of application of the testing method;
  • Translate NDT codes, standards, specifications and procedures into NDT instructions adapted to the actual working conditions;
  • Set up and verify equipment settings;
  • Perform and supervise tests;
  • Interpret and evaluate results according to applicable standards, codes, specifications or procedures;
  • Prepare UT TOFD written instructions
  • Carry out and supervise all tasks at or below level 2;
  • Provide guidance for personnel at or below level 2, and
  • Report the results of UT TOFD test

Days: 8 days training and 2 day exam
Duration: 80 hours

UT TOFD Level 2 training at Lavender International covers the following:

Syllabus specific to Ultrasonic Testing of Welds using Time of Flight Diffraction 


We provide examinations for Time of Flight Diffraction (TOFD) testing, including PCN personal certification examinations to Levels 2 and 3, plus examination for employers based schemes such as SNT-TC-1A, NAS410, EN4179, to Levels 2 and 3.

The PCN requirements for Level 2 TOFD are: 80 hours training direct to Level 2 and 12 months supervised work experience (which can be obtained before or after the examination and must be attained within 24 months of the exam date).

The options for TOFD Level 2 examinations are:

Initial Candidate
Resit (Theory)
Resit (Practical)

To be eligible for the PCN Level 2 examination, an eye test must be passed (near vision and colour) and candidates must hold Level 2 PCN Certification in Ultrasonic Weld Testing The TOFD Level 2 examination includes a specific paper and practical exam.

Direct to Level 2, the PCN requirements for for Ultrasonic TOFD Level 2 are: 12 months supervised work experience to be obtained before or after the examination and must be attained within 24 months of the exam date.

For employer based schemes the expected amount of work experience should be determined in the written practice.

Ultrasonic TOFD courses are taking place around the world with Lavender international.


UK office – Penistone USA office – Houston, Texas On-site locations
Click here for available dates Click here for available dates Contact us


UK office – Penistone USA office – Houston, Texas
Weekly Contact us

If you would like further information about this course, please contact us.


Scientific calculator
Safety boots and overalls
Lab coat

All other equipment and training materials (with the exception of Level 3 Text Books) are provided by Lavender International.

Protective gloves, protective eye glasses and plastic aprons are also available for the use of students if required.

Candidates MUST bring their PCN Wallet Card.
If you do not have a wallet card bring some other form of identification showing a photograph, i.e. Passport or Photo Driving Licence.

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