Abstract: Artificial simulated natural defects were designed and manufactured for the phased array ultrasonic testing (PAUT) of manual welded pipeline circumferential welds. PAUT+ultrasonic time of flight diffraction (TOFD) method and radiographic testing (RT) were performed, and the testing results were analyzed. The experimental results showed that PAUT, TOFD, and RT testing had their own advantages and disadvantages. PAUT+TOFD was sensitive to area type defects, but the detection rate was not high for small point type defects, But the synchronous detection speed of PAUT+TOFD was 2-3 times that of RT detection.