5. Industry drivers & challenges

• Drivers: safety and reliability requirements; need for faster inspections; workforce shortages; digital traceability; aging infrastructure.
• Challenges: skill gaps in advanced NDT methods; variability in AI model performance and limited labeled datasets; regulatory acceptance of novel methods; initial capital cost for automation and DR equipment.

• Phased Array Ultrasonic Testing (PAUT): Research papers highlighted the optimization of PAUT for complex geometries. Unlike conventional UT, PAUT allows for electronic beam steering, enabling the inspection of welds without mechanical scanning mechanisms.
• Total Focusing Method (TFM): 2021 saw an increase in the commercial and research application of Full Matrix Capture (FMC) and TFM. These advanced imaging techniques provide higher resolution images of weld defects, allowing inspectors to distinguish between lack of fusion and porosity with greater accuracy than standard PAUT.
• Time of Flight Diffraction (TOFD): The combination of TOFD with PAUT became the industry standard for critical infrastructure, offering both detection capability and precise sizing.

8. Recommendations for adoption (practical)

• Prioritize PAUT/TOFD for critical volumetric inspections; invest in operator training and qualified procedures.
• Transition to digital radiography where feasible to improve throughput and reduce dose.
• Pilot automated robotic inspection on repetitive long weld runs (pipelines, rails).
• Begin collecting labeled VT images and inspection data to develop or adopt AI models; ensure human oversight.
• Implement an inspection data management system with secure backups and traceability.
• Maintain compliance with applicable codes; validate new methods through trials and involved stakeholders (clients/regulators).