PHASED ARRAY ULTRASONIC TESTING (PAUT)

What Is Phased Array Ultrasonic Testing?

Phased array ultrasonic testing (PAUT) is an advanced form of ultrasonic testing that uses a probe containing many small ultrasonic elements, each pulsed independently. By controlling the timing of those pulses, the beam can be electronically steered, focused and swept through the test piece without physically moving the probe. The result is a fast, repeatable inspection that produces detailed cross-sectional images of welds, castings and components — far more information than a single-element ultrasonic probe can provide. For Australian asset owners, PAUT has become the established method for high-integrity weld inspection and engineering critical assessment.

How Phased Array Ultrasonic Testing Works

Each element in a phased array probe is fired in a precisely calculated sequence (a “focal law”), so the combined wavefront can be angled and focused at will. This lets a technician run multiple sectorial scans, true top, side and end views, and C-scans from a single probe position. Encoded scanning records probe position alongside the ultrasonic data, so every indication can be located, sized and re-examined later. Because focal laws update instantly, set-up is quick and the inspection is highly reproducible — which matters when results feed into fitness-for-service or pressure vessel inspection decisions.

Phased Array NDT Applications

Phased array NDT is used wherever weld quality and wall integrity are critical: pipework and pressure equipment in oil, gas and hydrogen plants; structural and storage-tank welds; mining and heavy-industry components; and corrosion mapping of vessels and pipelines. PAUT is frequently paired with time-of-flight diffraction (TOFD) for accurate flaw sizing, and complements other methods such as conventional ultrasonic inspection, magnetic particle inspection and eddy current testing within a complete integrity program.

Australian Standards & Compliance

APEC performs phased array ultrasonic testing to the relevant Australian and international standards, including AS 2207 (ultrasonic testing of fusion-welded joints in carbon and low-alloy steel), ISO 13588 (use of automated phased array technology), and the construction and in-service requirements of codes such as AS 1554, AS 4037 and AS/NZS 3788. Working to recognised standards means the inspection report stands up to client, regulator and insurer scrutiny.

PAUT vs Conventional Ultrasonic Testing and Radiography

Compared with conventional ultrasonic testing, PAUT covers more inspection volume per pass, images defects in cross-section, and removes much of the operator variability of manual scanning. Compared with radiography, it needs no exclusion zones or radiation controls, is safer to run alongside other site work, and gives immediate digital results with accurate through-wall sizing. For most modern weld and corrosion inspections, phased array ultrasonic testing delivers more information, faster, and with a stronger audit trail.

Why Choose APEC Inspection for Phased Array Ultrasonic Testing

APEC Inspection is a NATA-accredited inspection body, and our phased array ultrasonic testing is carried out by AINDT-certified technicians. We deliver clear, defensible reporting, mobilise across Newcastle, the Hunter and nationally, and integrate PAUT with the wider NDT and pressure vessel inspection services your assets need. To learn more, read our phased array ultrasonic testing articles or request a quote.