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    焊管常用探傷方法及技術(shù)

    Commonly-used NDT Methods and Techniques for Weld Pipes

    • 摘要: 介紹了焊管常用的3種探傷方法(漏磁探傷、渦流探傷和超聲波探傷)及技術(shù)。分析了3種探傷方法的優(yōu)缺點:漏磁探傷靈敏度高,能很好地分辨出焊管內(nèi)外壁缺陷,但長管體、大壁厚管在漏磁探傷后需做消磁處理;渦流探傷檢測速度快,但受趨膚效應(yīng)的限制,很難發(fā)現(xiàn)工件深處的缺陷;超聲波探傷穿透能力強、缺陷定位準確、成本低、速度快,但探傷操作需經(jīng)耦合,在北方嚴冬環(huán)境下耦合時焊管易凍結(jié),給探傷作業(yè)帶來不便。

       

      Abstract: Described in the paper are the three commonly-used NDT methods and techniques for weld pipe flaw inspection,i.e.,the MFL detection,the eddy-current detection and the ultrasonic detection.Also analyzed are the advantages and disadvantages of these methods.The MFL method features high sensitivity which ensures satisfactory identification of both outer and inner flaws of the pipe,but in case of long large-sized heavy-wall pipe,demagnetization is necessary to be carried out upon ending of the detection.As for the eddy-current method,although the detection speed is rather high,it is so difficult to find out any flaw located deep in the workpiece due to the Kelvin skin effect.And speaking of the ultrasonic method,the advantages are high penetrating force,high flaw-positioning accuracy,low operation cost,and high detection velocity,but medium coupling is needed for the detection,which may cause,in winter,the trouble of freezing of the pipe,particularly in hilatitude areas,thus make it rather difficult to keep the detection operation going smoothly.

       

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