Eddy current nondestructive testing method for spiral welded steel pipe

Pipeline transportation is an increasingly crucial method for the efficient transport of oil and gas. In China, large-diameter transportation pipelines predominantly use spiral welded steel pipes due to their mature manufacturing processes and low costs. However, to ensure the reliable operation of these pipelines, it is essential to strictly guarantee the quality of the spiral steel pipes used.

Nondestructive testing (NDT) of steel pipe welds remains a critical and challenging issue for many companies. Enhancing the effectiveness and reliability of flaw detection results has become a focal point in the ultrasonic automatic flaw detection of steel pipes. Through extensive research and years of experience in steel pipe flaw detection, a fully digital ultrasonic flaw detection system for spiral steel pipes has been developed. This system integrates precise probe tracking, microcontroller technology, and computer signal processing functions. Compared to traditional flaw detectors, the digital online ultrasonic automatic flaw detection system for spiral steel pipes offers several advantages:

Fast Detection Speed:

The system provides automatic detection, calculation, recording, depth compensation, and sensitivity setting.

High Detection Accuracy:

It performs high-speed data acquisition, quantification, calculation, and discrimination of analog signals, achieving higher detection accuracy than traditional instruments.

Recording and Archiving:

The system can record and archive detection data, including defect images.

High Reliability and Stability:

It comprehensively and objectively collects and stores data, performs real-time or post-processing, analyzes signals in time or frequency domains, and grades the quality of workpieces through pattern recognition. This reduces human factor influence and enhances retrieval reliability and stability.

Advanced Tracking Sensor:

Using a CCD camera tracking sensor for weld tracking, the system offers high detection sensitivity, resistance to water or gas interference, and simplicity and reliability.

Spiral welded steel pipes are extensively used in petrochemical, thermal pipe networks, urban water supply, and drainage projects, particularly in long-distance oil and natural gas pipelines. They are preferred in almost all oil and gas field pipelines due to their high safety, durability, and economic rationality. For more information about spiral welded steel pipes, please contact: sales@union-steels.com