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在双面埋弧焊钢管焊缝超声检测中,如何鉴定、判别回波超标是个关键问题。通过分析双面埋弧焊钢管焊缝实际超声波检测的特点,包括超声回波信号的偏析、夹杂、裂纹和母材分层等引起超声缺陷信号或非缺陷信号和钢管曲率半径对缺陷定位的影响,总结出耦合剂反射波、焊缝表面焊痕反射波、焊缝上下错位引起的反射波以及焊缝余高或咬边形成的非缺陷波四种伪缺陷波的成因和鉴别方法,提高了伪缺陷波判别的准确性,为直缝埋弧焊钢管实际超声波检测提供了新的思路和方向。
In the double-sided submerged-arc welded pipe ultrasonic testing, how to identify, determine the echoes is a key issue. By analyzing the characteristics of the actual ultrasonic inspection of the double-sided SAW pipe weld, including ultrasonic echo signal segregation, inclusions, cracks and base metal stratification caused by ultrasonic flaw signal or non-flaw signal and steel pipe radius of curvature on the defect location , Summarizes the causes and identification methods of the four kinds of pseudo-defect waves caused by the reflected wave from the coupling agent, the reflected wave from the weld marks on the weld surface, the reflected waves caused by the welding up and down misalignment, and the non-defect wave formed by the remaining weld height or the undercut, The accuracy of pseudo-defect wave discrimination provides a new idea and direction for the actual ultrasonic testing of LSAW steel pipe.