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焊縫超聲波檢測時DAC曲線的制作與應用.docx 65頁

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- -可編輯修改 - - -可編輯修改 - 焊縫超聲波檢測時DAC曲線的制作與應用 摘要 在超聲波檢測時,為了避免漏檢,超聲檢測人員通常用較高的靈敏度 (二次波或三次波的靈敏度)作為掃查靈敏度。當在掃查過程中發現缺陷 時,根據缺陷波距一次波、二次波(三次波)的水平位置遠近選用水平差 值最小的波次的靈敏度對缺陷進行定量。因此在超聲波檢測時應用 DAC曲 線,不僅可靈敏的監測出缺陷的位置所在,而且簡單方便。 本文分析了超聲波檢測在檢測時對檢測結果的分析,應用 DAC曲線和 DAC曲線的多種制作方法,并對比分析了各種 DAC曲線的制作方法優缺點 如:直線連接法;最小二乘擬合法;拉格朗日擬合曲線法等,并且還介紹 了增益型波檢測DAC曲線與衰減型檢測DAC曲線。 DAC曲線在實際工程中的應用很是廣泛。其中本文以TC4大直徑鈦合金 棒材超聲波探傷為例證明 DAC曲線可以對保證準確的靈敏度及建立曲線進 行聲程補償,可有效解決材料探傷雜波較高的問題,保證大直徑棒材的有 效檢測,以保證探傷結果的準確性、可靠性。 關鍵詞 超聲波檢測;DAC曲線;缺陷定量;評定依據 Production and Application of DAC Curve in Ultrasonic Testing of Welds Abstract In ultrasonic testing, in order to avoid detection, ultrasonic testing personnel usually with high sensitivity (sensitivity of two times wave or three times the wave ) as the scanning sensitivity. When the find defects during scanning process, according to the distance of defect wave from a wave, the two wave (the three wave) level location select the least level difference between wave sensitivity as the quantify defects. The application of DAC curve in ultrasonic testing, not only can sensitively detect the location of defects,but also be simple and convenient. This paper analyzed the ultrasonic testing in the detection of the analysis on the test results, making a wide variety of applications of DACcurve and DACcurve, and analyzed the advantages and disadvantages of various methods of DAC curve analysis such as: linear connection method; least squares fitting; Lagrange fitting curve method, and also introduces the gain wavedetection of DACcurve and DAC curve of attenuation measurement. Application of DAC curve in engineering practice is very extensive. Which based on the TC4 large diameter titanium alloy bars-ultrasonic testing as an example to demonstrate that DAC curve can be used for acoustic sensitivity to ensure the accuracy of compensation and establishment of curve, which can effectively solve the problem of high material testing noise, ensure the effective detection of large diameter bars, in order to guar

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