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The quantitative method of phased array ultrasonic testing for type-B sleeve fillet weld defects

LIU Yan;WU Yuxuan;YANG Fengping;TAO Rongde;ZHANG Hongbo;JIA Pengjun;PEI Cuixiang;DENG Gang;CNPC Tubular Goods Research Institute;State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Astronautics, Xi'an Jiaotong University;NO.8 Oil Production Plant of Petrochina Changqing Oilfield Company;PipeChina West Pipeline Company;  
Type-B sleeve repair is one of the main ways of oil and gas pipeline repair. In the welding process of repair, the hole defects represented by pores and slag inclusions often appear in the annular fillet weld of this structure. Due to the special structure of the fillet weld, it is difficult to analyze the defects quantitatively when using phased array ultrasonic nondestructive testing technology. Through numerical simulation and experiment,it is found that the peak value of defect echo signal obtained by phased array ultrasonic sector scanning is positively correlated with the diameter of hole defect, which provides a reliable method for quantitative analysis of hole defect.
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