管道补口热收缩带粘接质量的超声检测方法

为解决管道补口热收缩带剥离强度人工抽检效率低、人为因素影响大的问题，通过超声波理论分析以及对不同粘接强度管道补口试件的试验分析，以及采用超声检测技术对管道补口热收缩带的粘接质量进行无损检测，实现剥离强度的定性及半定量评价，确定了能够明显反映管道补口热收缩带剥离强度的超声波特征参数。研究表明：超声波信号平均功率和低频能量两个参量与热收缩带剥离强度呈反比，可用于剥离强度的全面、快速检测。基于这两个参数指标，采用超声波反射法对补口样品的测试结果与补口样品手动机械拉伸测试结果一致，验证了参数选择的有效性。超声波特征参数可为建立补口热收缩带粘接质量的超声无损检测方法提供参考依据。

Ultrasonic test on the heat shrinkable tapes used in the field coating for welded joints of pipeline

To test the peel strength of heat shrinkable tapes used in the field coating for welded joints of pipeline, artificial sampling is often inefficient and decided by human factors. In this regard, based on the ultrasonic theory analysis and the experimental analysis of test specimen of pipeline welded joint with different bonding strengths, the ultrasonic test technique is used in nondestructive testing of bonding quality of heat shrinkable tapes, so as to qualitatively and semi-quantitatively evaluate the peel strengths. Then, the ultrasonic characteristic parameters which can clearly reflect the peel strength of heat shrinkable tapes are identified. The research shows that both average power and low frequency energy of ultrasonic signal are inversely proportional to the peel strength, which can used to detect the peel strength comprehensively and rapidly. In view of these two parameters, the test result of welded joint sample with the ultrasonic wave reflection method agrees with the manual mechanical tensile test, verifying the effectiveness of such parameters. Ultrasonic characteristic parameters can provide a reference to the ultrasonic non-destructive test of bonding quality of heat shrinkable tape.