Overview

Our Travelling Gantry Type
Welded Pipe Ultrasonic Inspection Machine is a fully automatic CNC-controlled NDT system engineered for 100% volumetric inspection of medium and large-diameter production tubing.
Equipped with high-performance ultrasonic transducer arrays, it achieves high-sensitivity detection of longitudinal cracks, transverse fractures, inclined flaws and laminar delaminations. This unit carries out precise full-length wall thickness measurement concurrently with flaw detection in a single inspection pass.
All inspection workflows and data logging fully conform to official API 5CT and API 5L standards, ideally satisfying stringent quality control requirements for OCTG manufacturers serving the global oil and gas industry.
Working Principle
The machine operates on the ultrasonic pulse-echo technique. High-frequency ultrasonic waves (2–5 MHz) are generated by piezoelectric probes and transmitted into the pipe wall via water-coupling.
- No defect: Ultrasound travels through the wall and reflects from the inner surface, producing a back-wall echo.
- With defect: Waves reflect earlier at discontinuities (cracks, inclusions, laminations), generating a defect echo before the back-wall signal.
- The system calculates defect depth, size, and position based on echo time and amplitude, enabling accurate, repeatable, and high-speed inspection.