Design and Calibration of Artificial Reference Indicators for Auto Ultrasonic Inspection of SAWH Steel Pipe Weld Seam

This paper introduces a method for calibration of ultrasonic inspection used for spiral submerged arc welded steel pipes, which is to achieve a newly added method for calibration on the basis of the existing practice through the calibration of the new type reference indicators, and the new method can be the supplement of ultrasonic inspection used for the middle area of SAWH steel pipes with large wall thickness. A detailed description of this method was presented in the paper and its feasibility and effectiveness were verified in the trial production of SAWH pipes with large wall thickness.