Time-of-Flight Diffraction (TOFD) measures the ultrasonic energy diffracted from the tips of a flaw rather than the energy reflected from its face. This makes it highly sensitive to cracks regardless of their orientation and exceptionally accurate for through-wall height sizing.
A single TOFD pass covers the full weld volume quickly, which is why it is frequently combined with PAUT for pre-service and in-service weld programs on pressure equipment and pipelines.
Typical Applications
- New-construction weld qualification
- In-service crack monitoring and growth tracking
- Heavy-wall vessel and pipework welds
- Combined PAUT + TOFD inspection packages
Why TESKO NDT
- Excellent crack-height sizing accuracy
- Fast, single-pass volumetric coverage
- Orientation-independent flaw detection
- Recordable digital data set
Standards & Codes We Work To
ISO 10863 (TOFD of welds)ASME BPVC Section V, Article 4EN ISO 15626 (acceptance levels)