Repair of Welded Joints Made of Steel P91 (X10CrMoVNb9-1) by a Backing Run of the Selected Site with Heat Treatment

Power Technology and Engineering - The results of complex studies of welded joints made of steel P91 (X10CrMoVNb9-1) with repair welding performed in OAO VTI are presented. A control weld joint was...     

Analysis of the development of damage in a welded junction in the hot intermediate superheat steam duct of 800-MW generator units

Data from a metallographic study of a damaged weld junction in a hot intermediate superheat steam duct and a computational model for crack development (in the damaged zone) by a creep mechanism are described. Anumerical calculation confirms the possibility of crack development to the known final size over a time of approximately 15,000 h, which corresponds to the operating time for the steam duct from the last time it was inspected until the time of a through fault, under conditions such that a 2.5-mm-deep surface crack (with a length of ∼50 mm along the surface) had been overlooked during this last inspection. Translated from élektricheskie Stantsii, No. 10, October 2008, pp. 29–35.     

On Some Features of Repair Welding Without Heat Treatment of Power-Generating Equipment Made of Pearlite Steels

Power Technology and Engineering - Features of welding heat-resistant steels when repairing cased power-generating equipment without heat treatment are outlined. It is shown that, by adjusting the...