Solution: ToFD – Time of Flight Diffraction
Solution: ToFD – Time of Flight Diffraction
ToFD (Time of Flight Diffraction):
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ToFD (Time of Flight Diffraction):
About ToFD (Time of Flight Diffraction):
The TOFD method (Time of Flight Diffraction) is an ultrasonic testing method that is primarily used for testing weld seams. While defects in the material are usually detected by analyzing reflected signals, TOFD primarily uses the diffraction signals caused by imperfections. TOFD is one of the few inspection techniques that is able to describe a defect or imperfection relatively accurately in terms of length, depth and height. All other ultrasonic testing methods describe a discontinuity on the basis of the reflection behavior and not on the basis of the actual expansion.
Advantages of ToFD procedures
Same results as with radiographic testing but:
- increased test speed
- no complex radiation protection measures
- Wall thickness range up to 300 mm can be tested according to standards without the cost-intensive use of a linear accelerator
Use of ToFD method
- Weld seam testing in accordance with EN ISO 10863 from a wall thickness of 6 mm up to 300 mm
- Testing of thick-walled pressure vessels in accordance with the ASME Boiler and Pressure Vessel Code in Section VIII (replaces radiographic testing as the primary test method)
- Outside of standardization: crack depth determination and monitoring on welded structures (e.g. steel bridges) or corrosion tests as part of periodic inspections (e.g. clad pressure vessels and reactors). Here, the ultrasonic processes are simulated in advance in order to determine the optimum testing technique.
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