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