超聲導(dǎo)波技術(shù)在小直徑無縫鋼管檢測(cè)中的應(yīng)用

Application of Ultrasonic Guided-wave Technique to Detection of Small-sized Seamless Steel Tube

摘要: 介紹了超聲導(dǎo)波技術(shù)在小直徑無縫鋼管檢測(cè)中的應(yīng)用情況,提出了符合超聲導(dǎo)波檢測(cè)的具體工藝及檢測(cè)結(jié)果的判定方法。實(shí)踐表明,該檢測(cè)方法對(duì)于無縫鋼管的裂紋、外折、翹皮等常見缺陷十分敏感,檢出效果有保障,但對(duì)凹坑類缺陷的檢出率較低;對(duì)于小直徑厚壁管(外徑≤76mm,壁厚∧10mm)的內(nèi)壁缺陷,檢測(cè)信噪比低,檢測(cè)難度大。

Abstract: Introduced here in the assay is an ultrasonic guided-wave NDT method for inspection of small- sized seamless steel tubes. Put forward are the specific detection process, and the method for evaluation of the detection result. Lots of cases of site operation practice shows that the said NDT process is very sensitive to common defects of the seamless steel tube like crack, outer fold and fin, etc., and the inspection effectiveness is ensured. Nevertheless, there are some disadvantages staying with this process, such as low detection rate of pitted defects, and that in case of identifying inner defect of small-sized heavy tubes (D≤76 mm, S>10 mm), it will be rather difficulty to perform the detection due to the low signal-noise ratio.