Study on echo characteristics of fillet weld in small diameter branch pipe of pressure vessel by phased array detection
The fillet weld model of small diameter nozzles of pressure vessels was simulated and analyzed by CIVA software.The echo response law and characteristics of typical defects such as ball hole,through hole,incomplete fusion,incomplete penetration and crack were studied.The results show that the echo intensity of different defects is different compared with the signal of end-angle structure.The echo intensity of the area defect is highest when the beam angle is 90 °.The echo intensity of the same defect is obviously different when it is in different positions,the maximum reaches 13 dB.The simulated specimens with typical defects were designed and processed.The test results of five typical defects were analyzed.The results show that the defects in the samples can be effectively detected.The change rule of echo characteristics of different defects was summarized,which can provide reference and basis for defect qualitative analysis in field inspection.
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