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首页> 外文会议>2001 International gas research conference >ULTRASONIC REFLECTION FROM CRACKS IN ELECTRICRESISTANCE WELDS IN GAS PIPES
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ULTRASONIC REFLECTION FROM CRACKS IN ELECTRICRESISTANCE WELDS IN GAS PIPES

机译：气体管道中电阻焊接裂纹的超声反射

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The guaranteed integrity of welds in high-pressure gas pipeline is of paramount importancernnecessitating the use of non-destructive examination. Lifetime predictions for pipes are madernbased upon production specifications of material properties and the assumption of no pre-existingrnweld defects. The welds are ultrasonically scanned for defects as part of the production processrnand so the prerequisites for lifetime prediction are fulfilled. However, a case has arisen whererncracks were identified in seam welds during the installation of a pipeline that had previouslyrnpassed production inspection. Subsequent hydrostatic testing of several manufacturing batchesrnfrom the same pipeline revealed welds of low toughness, prone to crack growth. This paper detailsrnan investigation into several methods used for the comparison of two pipeline sections. The aim isrnto determine whether a non-destructive, ultrasonic approach can be taken in order to distinguishrnbetween regions of strong and weak welding and concludes that this will necessitate the use ofrnmuch higher frequencies than is practical in conventional ultrasonic testing.
机译：确保高压气体管道中焊缝的完整性至关重要，因此必须使用无损检查。管道的使用寿命预测是基于材料性能的生产规格和不存在焊接缺陷的假设而做出的。作为生产过程的一部分，对焊缝进行超声扫描以查找缺陷，因此可以满足寿命预测的先决条件。但是，出现了这样的情况：在以前通过生产检查的管道安装过程中，在缝焊缝中发现了裂纹。随后在同一条管道上对数个制造批次进行静水压测试，发现焊缝韧性低，容易出现裂纹。本文详细介绍了用于比较两个管道段的几种方法。目的是确定是否可以采用非破坏性的超声方法来区分强焊接区和弱焊接区，并得出结论，这将需要使用比常规超声测试高得多的频率。

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