油气管道环焊缝自动超声检测与射线检测方法对比

Contrast of AUT/RT Detection Method on Oil and Gas Pipeline Girth Weld

针对AUT(自动超声检测)与RT(射线检测)检测管道环焊缝结果不一致的问题,结合AUT与RT检测原理,制作了校准试块及含人工缺陷焊缝,制定了AUT与RT检测管道焊缝试验方案,根据试验方案对人工缺陷焊缝进行了对比检测,在此基础上分析AUT与RT对管道环焊缝缺陷的检出率。结果表明:AUT对全自动焊产生的未熔合缺陷具有很高的检出率;RT检测自动焊环焊缝坡口时,若射线方向与未熔合缺陷方向一致,则检出率最高,但随着射线方向与未熔合缺陷角度的增大,检出率降低,容易漏检。

Aiming to inquire into the issue of different results by AUT/RT testing for circumferential welding,a testing plan for AUT/RT was proposed by designing and manufacturing the calibration block with artificial defects of weld and by the combination of AUT/RT detection principle.The AUT/RT testing on artificial defects of weld was carried out according to the testing scheme and the detection rate of AUT/RT for circumferential welding was analyzed based on the test result.The test results showed that the AUT has very high detection ability for the incomplete fusion flaw by automatic welding,and for RT test for automatic welding bevels,the detection rate is highest when the X-ray direction is consistent with the incomplete fusion.The detection rate is reduced with angle increased and the detection will be prone to undetected error.