Abstract: During automatic ultrasonic testing (AUT) of steel catenary riser (SCR) welds, it is required that the AUT technology should have reliable detection ability and high detection accuracy. The reliability of the AUT weld defect evaluation results and the metallographic examination results was verified by the modified AUT defect evaluation method. The results show that the modified AUT evaluation results are in good agreement with the actual size of the defect, which provides a reference for the installation engineering application of SCR pipeline based on the engineering critical analysis (ECA) acceptance standard.