TOFD (Time of Flight Diffraction) is a new ultrasound technique based on the diffraction waves emitted by discontinuities when excited with an ultrasound signal. It is ideal for inspection of large thicknesses and, because it allows a register to be filed, this technique is recognised in the applicable standards and codes as a substitution for X-rays, making it possible to eliminate bottlenecks, hold times, radiations, etc., so positioning TOFD as a technique of the future when it comes to inspection of very thick welds in pressurised equipment.
Characteristics of NDTs using TOFD
- NDT substituting for RT. Accepted in standards
- Longitudinal and circular welds
- Major thicknesses
- Elimination of the RT bottleneck
- Environmental enhancement
- High added value. Profitability
- Real time
The advantages of TOFD
- Highly accurate and sensitive
- Increased evidence
- Fast
- Secure cover
- Understandable presentation
- Rapid Reports / rapid decision-making
- Permanent registration of all parameters
- Offline Interpretations and Measurements
- Objective Advice
- Excellent Repeatability
The advantages of TOFD over RT
- Elimination of the bottleneck
- Registration of volumetric trial
- Enhanced environmental and personal security