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Time of Flight Diffraction (TOFD)

Time of flight diffraction (TOFD) is an advanced ultrasonic non-destructive testing method used for inspection of welds. Time of flight diffraction (TOFD) is one of the most reliable NDT method for pre-service and in-service inspection of welds. An accurate assessment of welded joints is necessary for stability, safety, integrity for maintaining the reliability of parts. 

This ultrasonic method (UT) method has an application in variety of industries like Petrochemical, Oil and Gas, automobile, fabrication and many others.

Major advantage of TOFD (time of flight diffraction) includes: 

  •    No shutdown is required.
  •    Inspection data is recorded and can be stored digitally.
  •    Real-time imaging.
  •    Fast inspection can be done.
  •    All types of weld defects can be detected.
  •    Accurate sizing of the discontinuities can be done.

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Two probes are placed on the opposite side of the test piece, one probe acts as a transmitter while the other probe acts as a receiver. When there is no flaw is detected the receiver picks up two waves – one wave travels along the surface and other reflects from the backwall. If there is any defect there is a diffraction from the tip of the discontinuities. By calculating the time of flight of the pulse, the depth of the discontinuities can be calculated by trigonometry.

TOFD is often used in conjunction with other NDT method such as PAUT.  

Our inspectors are ASNT Level 2 qualified and are highly experienced in using this testing method. Our expertise can help you to ensure that your welded structures and equipments  are in compliance with the industrial codes, standards or customers requirements.
ANDT offers a wide range of NDT methods. Therefore we can provide you with any other  method as well to compliment  TOFD to perform a single-sided inspection of welds.

Know more about the upcoming training schedule, by clicking here. 

ANDT- Centre of Excellence in Inspection, Equipment, and Training

ANDT has 1000+ satisfied professionals and Clients in manufacturing, processing, in-service NDT inspection of nuclear, aerospace NDT, automobile components, castings, forgings, Welds, fabrication of structures, oil & gas exploration companies, petroleum refineries, shipbuilding, cross country pipeline constructions, NDT TRAINING INSTITUTES for NDT Techniques in India and abroad. 'ANDT' is in top NDT Institutes in India for NDT Courses in Delhi NCR, NDT Courses in Greater Noida, NDT Courses in Mumbai, NDT Courses in Hyderabad, NDT Courses in Bengaluru, NDT Course in India and is recognized globally for its quality integrity services with technology-driven resources.

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Nearly A decade of Excellence in Delivering Quality to the Customers.

ANDT was established by a team of eminent mechanical engineering experts with more than ten years of professional industrial experience with prominent industries of the power sector, pressure vessels, precision, and heavy engineering sectors, pipe systems, storage tanks, process plants, castings, forgings, fabrication, sugar, and cement industries, aerospace component manufacturing, material testing laboratories, consulting and NDT inspection companies.


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