奧氏體不銹鋼小徑薄壁管焊縫超聲相控陣檢測工藝

奧氏體不銹鋼小徑薄壁管焊縫超聲相控陣檢測工藝The Process of Ultrasonic Phased Array Inspection on Small Diameter Thin Walled Austenitic Stainless Steel Tube Weld

通過理論分析并參照DL/T 820-2002標準，深入分析了奧氏體不銹鋼小徑薄壁管焊縫超聲相控陣單側(cè)掃查時探頭及聲束的布置、各種參數(shù)的設(shè)置原則、DAC的制作等，提出了缺陷評定時缺陷波幅及長度的確定方法。通過分析表明，對于該小徑薄壁管的檢測，超聲相控陣技術(shù)可以得到與常規(guī)超聲檢測相同甚至優(yōu)于常規(guī)超聲的缺陷檢出效果。

In this thesis, through theoretical analysis and referring to DL/T 820-2002 standard, inspection of small diameter austenitic steel tube weld at single side of the seam by using phased array method, was deeply studied. Deduced the principle of probe setting, ultrasound beam and other parameters configuration was deduced and skills of making DAC was introduced, and methods of measuring the echo amplitude and sizing the length of the defects were also raised. By means of technical analysis, it is indicated that, detection on small diameter austenitic stainless steel tube, equivalent to or better than detecting result can be achieved by phased array method than conventional UT.