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传统油气管道焊缝缺陷检测技术对作业环境、管道表面质量要求较高,在低频振动环境下易受到电磁干扰,焊缝缺陷检测能力较弱。提出一种低频振动环境下,基于激光超声的油气管道焊缝缺陷检测方法研究,首先基于激光超声产生机理,构建一种用于焊缝缺陷检测的激光超声检测模型;依据热固耦合思想分析热应力的传递过程,并提取激光超声波在检测过程中的传播特性;对接收到的激光超声波信号进行希尔伯特变换,能够对油气管道中的缺陷位置、大小做出精确的判断和检测。仿真实验结果证明,提出的油气管道焊缝缺陷检测方法能够在低频振动环境下,快速地定位缺陷位置,检测精度高、误差率低。
Traditional oil and gas pipeline weld defect detection technology requirements of the operating environment, the pipeline surface quality is high, vulnerable to electromagnetic interference in the low-frequency vibration environment, weld defect detection ability is weak. In this paper, a method of laser welding defect detection based on laser ultrasound is proposed in this paper. Firstly, based on the mechanism of laser ultrasonic generation, a laser ultrasonic testing model for the detection of weld defects is proposed. According to the analysis of heat Stress transfer process and extract the propagation characteristics of the laser ultrasonic wave in the detection process. The Hilbert transform of the received laser ultrasonic signal can make accurate judgment and detection of the defect position and size in the oil and gas pipelines. Simulation results show that the proposed detection method of weld defects in oil and gas pipelines can quickly locate defects in low-frequency vibration environment with high detection accuracy and low error rate.