AUTOMATIC ARC WELDING IN MANUFACTURE AND RENOVATION REPAIR OF PIPE ELEMENTS OF SPIRALS OF HIGH-PRESSURE HEATERS OF NPP POWER UNITS

摘要

The paper considers the possibility for applying automatic orbital welding using nonconsumable electrode in helium or plasma welding using the methods of autopressing or successive penetration to produce welded joints of pipe elements of spirals in high-pressure heaters. The results of testing this technology and the optimal modes of producing position welded joints of pipe elements in spirals of high-pressure heaters of NPP power units are presented. A description of technical proposals on creation of domestic welding equipment for implementation of the proposed technology was presented. It is shown that the use of the developed technology applying domestic equipment can significantly increase the labour efficiency when producing welded joints of pipe elements in spirals of high-pressure heaters and significantly improve their quality.