PAUT is particularly effective for detecting planar defects like lack of fusion, cracks, and incomplete penetration. The sectorial scan (S-scan) displays a cross-section of the weld, making it easier to size and position indications. Codes such as ASME Section V and ISO 13588 provide guidelines for technique qualification and acceptance criteria.
One often overlooked advantage is the ability to store full data files. This enables offline analysis, comparison with previous inspections, and audit trails for quality documentation. For welding coordinators, PAUT data can be used to validate WPS performance and reduce repair rates.
However, PAUT requires skilled operators and rigorous calibration. The technique is only as good as the setup and the person interpreting the data. Proper training per ISO 9712 and regular proficiency checks are essential.
How has PAUT improved defect detection on your projects?