Technology for repairing working blades of steam turbines. II. Repair by the combined welding and surfacing method

The combined method of restoring the efficiency of the working blade is based on welding inserts of high-chromium steel to the body of the blade and subsequent deposition of a high-Cr layer on the inlet edge in the zone of the austenitic weld, followed by post-weld treatment under high-temperature c...

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Bibliographic Details
Published in:Welding international 1999-01, Vol.13 (8), p.660-664
Main Authors: Khromchenko, F A, Lappa, V A, Fedina, I V, Karev, A N, Dolzhanskii, P R
Format: Article
Language:English
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Summary:The combined method of restoring the efficiency of the working blade is based on welding inserts of high-chromium steel to the body of the blade and subsequent deposition of a high-Cr layer on the inlet edge in the zone of the austenitic weld, followed by post-weld treatment under high-temperature conditions. This variant of the repair technology results in high cold cracking resistance of the butt welded joint in the weld zone of the high-Cr, martensitic-ferritic steel prior to high-temperature tempering as a consequence of the presence of an austenitic high-nickel weld and high erosion resistance (and fatigue strength) of the inlet edge of the blade as a result of formation of a homogeneous (as regards structure) metal, i.e. high-Cr steel, along the entire length of the blade edge. Material: 15Kh11MF chromium molybdenum vanadium steel.
ISSN:0950-7116