Phased Array Ultrasonic Testing (PAUT)
Typical application
PAUT is commonly applied for:
• Weld inspections (pipes, vessels, structures)
• New build fabrication inspections
• In-service weld assessments
• Detection of volumetric and planar defects
• Weld geometry and flaw sizing
PAUT is often used as an alternative or supplement to radiography.
Suitable inspection scenarios
PAUT is suitable when:
• Quantitative defect sizing is required
• Access is available from one side
• Weld geometry is known and controlled
• High inspection reliability is required
• Radiation-free inspection is preferred
PAUT supports acceptance and fitness-for-service inputs, when properly applied.
Not suitable / limitations
PAUT is not suitable for:
• Complex or unknown geometries
• Coarse-grained or highly attenuative materials
• Rough surfaces without preparation
• Inspections without qualified procedures
Limitations include:
• Strong dependence on calibration and setup
• Operator and interpretation skill required
• Procedure development effort
• Access constraints may still apply
Safety considerations
PAUT is suitable when:
• Quantitative defect sizing is required
• Access is available from one side
• Weld geometry is known and controlled
• High inspection reliability is required
• Radiation-free inspection is preferred
PAUT supports acceptance and fitness-for-service inputs, when properly applied.
Description
Phased Array Ultrasonic Testing (PAUT) is an ultrasonic inspection technique that uses multiple ultrasonic elements to electronically steer, focus and scan an ultrasonic beam. This allows inspection of welds and components from multiple angles without physically moving the probe. PAUT provides quantitative volumetric inspection data.
Pros
Pros Cons
ConsSafety aspects include:
• Radiation-free inspection
• Electrical and equipment safety
• Ergonomic considerations during scanning
PAUT reduces radiation exposure compared to RT but does not eliminate other inspection risks.
Limitations to consider:
• Complex setup and calibration
• Interpretation requires expertise
• Surface preparation often required
• Higher equipment and training cost
• Not suitable for all materials
Disclaimer
Information on this page is indicative and context-dependent.
PAUT does not replace applicable codes, standards or engineering judgement.
Inspection planning, procedure qualification and acceptance decisions remain the responsibility of the asset owner and inspection professional.