Time of Flight Diffraction (ToFD) is an advanced ultrasonic testing technique used for detecting and sizing flaws in materials, particularly in welds. ToFD works by sending two ultrasonic beams into the material being examined, one acting as a transmitter and the other as a receiver.
When a flaw or defect is present, the ultrasonic waves will diffract or scatter. The time it takes for the diffracted wave to reach the receiver is then measured, which provides information about the size and location of the flaw. By analyzing the time of flight of the diffracted waves, ToFD can provide highly accurate and detailed information about the type and size of defects present in the material.
ToFD is known for its high level of sensitivity and accuracy, making it a popular choice for inspecting welds in critical applications such as in the aerospace, nuclear, and oil and gas industries. It is a non-destructive testing method that can provide valuable information without causing damage to the material being examined.