钢桥面板顶板与U肋焊缝超声波穿透法检测技术研究

Study on the Ultrasonic Penetration Testing Technology of Weld Between Steel Bridge Deck Roof and U-rib

文中采用预制裂纹试件对钢桥面板顶板-U肋焊缝水平裂纹进行超声波检测方法研究.考虑顶板与U肋焊缝结构特点及超声波检测技术特征,提出一种超声波双探头穿透检测方法.该方法通过裂纹对穿透信号波的遮挡效应,可实现焊缝内部疲劳裂纹的检测,并通过相关试验对该方法进行了验证.结果表明:随着焊缝内部疲劳裂纹长度的增加,接收探头所收到的声波强度逐渐降低,回波高度呈下降趋势.

In this paper,prefabricated crack specimens were used to study the ultrasonic testing method for horizontal cracks of the steel bridge deck roof-U-rib weld.Considering the structural characteristics of welding seam between roof and U rib and the technical characteristics of ultrasonic testing,an ultrasonic double probe penetration testing method was proposed.This method can detect the fatigue crack in the weld seam through the shielding effect of the crack on the penetrating signal wave,and the method is verified by relevant tests.The results show that with the increase of fatigue crack length in the weld,the intensity of sound wave received by the receiving probe gradually decreases,and the echo height shows a downward trend.