Abstract
Some Automatic Ultrasonic Testing Systems (AUT) which consist of anautomatic scanning system, an ultrasonic testing system with several proves and a computer have been developed recently. In order to adopt these AUT systems for the non-destructiveexamination of weld bridge members as the substitute for Xray testing, the performance of AUT systems has been examined Test pieces which include various weld defects were made and tested by using five AUT system beside Xray and manual ultrasonic test Advantages and disadvantages of AUT system, characteristics of ultrasonics tests are discussed from the view paint of fatigue and fracture control of bridge members.
