FEATURES OF ULTRASONIC MONITORING OF WELDED JOINTS OF VESSELS AND EQUIPMENT MADE OF CHROMIUM-NICKEL STEELS OF THE AUSTENITIC AND AUSTENITIC-FERRITIC CLASSES

摘要

Theoretical bases and the results of experimental studies and practical application of ultrasonic monitoring (USM) are considered for butt and corner welded joints and equipment made of corrosion-resistant steels of the austenitic and austenitic-ferritic classes with a wall thickness of 4-30 mm. It is shown that the reliability of detecting impermissible weld defects relates to the requirements of specifications. USM entirely replaces radiographic monitoring. In manufacturing vessels and equipment made of corrosion-resistant (CR) steels, i.e., highly-alloyed steels of the austenitic and austenitic-ferritic classes, the following forms of welding are used: manual arc, automatic and semi-automatic, beneath a layer of flux, in a protective gas atmosphere, automatic beneath a layer of flux with a granulated addition and electroslag [1, 2].