The Technique of Ultrasonic Testing for the Thin-Walled Pipes with Variable Wall Thickness and Automatic Detection System
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摘要: 针对壁厚0.65~1.2 mm，最小深度为0.045 mm的裂纹缺陷特征，提出了水浸正交超声板波检测方法和基于螺旋扫描方式的数据处理算法。设计了零漏检，低误判的全自动线性定量检测。通过多通道超声波发射/接收和信号特征提取方式，系统达到了6 s/件的在线检测速度。Abstract: In order to detect the microcrack defect with 0.045 mm minimum depth located at the shell thickness of 0.65~1.2 mm, an orthogonal water immersion system with ultrasonic lamb wave testing was designed with data processing algorithm being based on helical scan mode. The system could achieve automatic quantitative testing result of zero undetected fault with low false call rate. Through multi-channel ultrasonic signal transmitting / receiving design and the feature extraction system, the system testing speed was of 6 s per piece.
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