Revolutionary new tool: discover the enefits of Time of Flight Diffraction

The world of NDT is always changing and evolving and in this blog will look at one groundbreaking technique —Time of Flight Diffraction (TOFD). 

What is Time Of Flight Diffraction? What advantages does it offer in terms of accuracy, efficiency, and cost-effectiveness? 

If you’re looking to enhance your inspection processes, save money, reduce operational downtime, and ensure the safety of your assets, it’s time to find out more about TOFD.

Unravelling the mystery of Time of Flight Diffraction

Time of Flight Diffraction testing, often referred to as ultrasonic time of flight diffraction, is a non-intrusive inspection method that uses ultrasonic waves to detect and characterise flaws within materials. 

Two ultrasonic probes are placed on opposite sides of the component to be tested. One of the probes acts as a transmitter and sends out an ultrasonic pulse that is picked up by the other probe which is the receiver. 

If there is a flaw, such as a crack, there is a diffraction of the ultrasound pulse from the tips of the crack. By measuring the time of flight of the pulse, the depth of the crack can be calculated. 

As there is a “dead zone” just under the surface of the component that the probes cannot detect, TOFD is always used alongside other testing methods. 

Unlike traditional inspection methods, TOFD provides a comprehensive view of the inspected material, offering precise measurements of flaw dimensions and locations.

Interested? NDT Group offers a range of NDT services, including Time of Flight Diffraction. Contact us to find out more. 

Learn how we recently used TOFD to identify flaws caused by Stress Corrosion Cracking for a pharmaceutical company here.  

Benefits of TOFD

1. Accuracy 

Traditional inspection methods may struggle to provide precise measurements, but TOFD excels in delivering highly accurate measurements of internal flaws. 

2. Time-efficient inspection processes

Secondly, TOFD’s real-time data acquisition means we can significantly reduce the time it takes to conduct an inspection, minimising operational downtime. 

3. Cost-effective asset management

The accurate and reliable data provided by TOFD minimises the need for repeated inspections or costly repairs. 

By identifying flaws early, you can address issues before they escalate into major problems. 

This proactive approach not only saves money but also extends the lifespan of your assets, optimising your return on investment. 

Drawbacks of TOFD 

Like many NDT techniques, there are some drawbacks to TOFD.

TOFD may encounter challenges when inspecting irregularly shaped or highly contoured surfaces, potentially leading to inaccurate results. This is why TOFD is usually used alongside other NDT methods. 

Embracing the future: harnessing the power of TOFD

TOFD is accurate, efficient, and cost-effective, making it a great tool for asset management and safety assurance. 

By incorporating TOFD into your inspection processes,  we make sure we are saving you money and reducing operational downtime. You can have confidence that your assets are in optimal condition. 

Responsive testing that delivers assurance that your equipment is safe.

Contact us for a quality testing service with a fast report turnaround. We can respond to any challenge.


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