Yao Huan,Tang Kai,Han Zhixiong,et al.Ultrasonic phased array layered focusing detection method for CRC-type welds in oil and gas pipelines[J].China Petroleum Machinery,2026,54(9):126-134.
Yao Huan,Tang Kai,Han Zhixiong,et al.Ultrasonic phased array layered focusing detection method for CRC-type welds in oil and gas pipelines[J].China Petroleum Machinery,2026,54(9):126-134.DOI: 10.12473/CPM.202510038.
Ultrasonic Phased Array Layered Focusing Detection Method for CRC-Type Welds in Oil and Gas Pipelines
Conventional ultrasonic detection of oil and gas pipeline welds is deficient for bulky scanner structures and difficult on-site installation and calibration. This paper proposes a detection method for CRC-type pipeline welds based on the principle of ultrasonic phased array layered focusing. By groove morphology and structural characteristics, the CRC-type pipeline welds are divided into 12 depth layers. The ultrasonic phased array layered focusing laws and detection process were designed, the delay time for each layer was calculated, and specific adjacent array elements were selected to excite the focused acoustic beams. On this basis, a finite element two-dimensional transient simulation model for ultrasonic phased array detection containing typical defects such as lack of fusion and pores was established to obtain the A-scan signal during the single deflection focusing process. Furthermore, ultrasonic phased array layered focusing scanning comparative experiments were performed. The experimental results show that, at the lack-of-fusion defects in the 5th and 10th layers and the root-pass pore defect in the 12th layer, the maximum amplitude of the echo signal can reach about 40% of that of the excitation initial wave, verifying the feasibility of the layered focusing detection technique. The layered focusing detection technique exhibits good layer-by-layer analysis capability for welds. Compared with conventional TOFD detection, it measures the defect height with a relative error controlled below 8%. The research provides technical support for ultrasonic phased array detection of welds in oil and gas pipelines.
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