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3. Time of Flight Diffraction (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 principal 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.

PCN Level 1 & 2

This course is designed to provide the participants, a better understanding about theory and application of time-of-flight diffraction. This TOFD welds course provides detailed information on the inspection of ferritic steel welds by the ultrasonic time of flight method. Suitable for personnel with existing UT Certification in welds, and recognized by PCN, providing excellent preparation for the Level 1 and 2 examinations.

PCN Level 3

This guidance course is aimed at the PCN Level 3 requirements for ToFD practitioners. The main objective of the course is to make candidates fully aware of the scope of the examination and level of knowledge required. It will also enable candidates to identify their weak subject areas. Advice will be given on any further tuition required.

Training Hours

Level 1	Level 2	Level 3
40 Hrs	40 Hrs	40 Hrs
Direct access to Level 2 requires the total hours shown in table for Levels 1 and 2

Experience

Level 1

Level 2

Level 3

3 months

9 months

36 months

Note-1: For Level 2 certification, the intent is that work experience consists of time as a Level 1. If the individual is being qualified directly to Level 2, with no time at Level 1, the experience shall consist of the sum of the times required for Level 1 and Level 2. No reduction in the period of experience shall be allowed

Note-2: Industrial NDT experience in the appropriate sector may be acquired either prior to or following success in the qualification examination.

• PSL 57-A Initial Examination application
• PSL 30- Log of Experience
• PSL 44-Vision Requirements (which has to be certified by a registered medical practitioner)
• CP-27 code of ethics
• PCN ID (wallet or e-certificate) -only for existing PCN certificate holders
• PCN UT level II/III Certificate copy
• One govt approved identity card (example: Passport/voter ID /Aadhaar Card)

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