In view of the problems regarding high temperature's influence upon defect's location and quantification encountered in ultrasonic inspection of pipelines with butt welded joints under high temperature conditions

a set of ultrasonic inspection technology under high temperature conditions has been put forward through theoritical analysis and tests

and verification being made in the inspection process of steam header with butt welded joints in the power station of Anqing Petro-chemical General Plant under China Petro-chemical Group Company. Practice shows that the said method to be accurate and feasible.