Phased array ultrasonic testing for lap fillet welds of pressure vessels in service

In order to improve the detection efficiency and reliability for internal defects in lap fillet welds of pressure vessels in service, a comparison block was designed and a phased array ultrasonic testing technology verification test was carried out. The data map of phased array ultrasonic testing obtained in verification test is analyzed, and the results show that the process can identify and evaluate typical internal defects of lap fillet welds.