铝制焊接容器超声导波成像检测

Ultrasonic guided waves imaging testing on aluminum welded shell

针对中厚板铝制焊接容器的安全评价需要,论文研究了超声导波成像检测技术。通过对铝制焊接容器中不同模态超声导波的频散曲线及波结构分析,选择激励频率为2 MHz的S1模态作为中厚板铝制焊接容器健康监测的导波模态,并研制了适合铝制容器检测的2 MHz/S1模态压电晶片换能器,建立了超声导波成像系统。实验结果表明,该方法仅需经过有限次的扫查,就可以得到容器全壁厚范围内健康信息的超声导波图像,从而清晰地识别容器内的缺陷。该研究为中厚板铝制焊接容器的健康监测提供可行的技术方案。

For the safety evaluation of medium aluminum welded vessels, guided waves imaging is investigated. Based on the analysis of the characteristics of guided waves propagated in medium aluminum welded vessels, this study select 2 MHz/S1 as the health monitoring guided wave mode, and 2 MHz/S1 mode piezoelectric transducer suitable for aluminum vessel detection was developed , then this study developed the guided waves imaging system. The experimental results show that, only after a finite scanning, this method can get the guided wave ultrasonic images, which reveal health information of full wall thickness range. The developed method provides feasible scheme for health monitoring of medium aluminum welded vessels.