Life Extension with Ultrasonic Treatment of the Weld Connections of Npp Equipment

Pipelines and metal structures in NPP are joined together by means of welding. Welding has signicant advantages, such as saving of metal due to more complete use, reduction of structural mass, and creation of hermetic joints. The operational characteristics of a weld joint are lower than that of the...

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Bibliographic Details
Published in:Atomic energy (New York, N.Y.) N.Y.), 2016-11, Vol.121 (1), p.70-74
Main Authors: Trofimov, A. I., Trofimov, M. A., Minin, S. I., Talabanov, M. G., Murachev, E. G.
Format: Article
Language:English
Subjects:
Analysis
Crystallization
Deformation
Grain size
Hadrons
Heavy Ions
Metals
Metals (Materials)
Methods
Nuclear Chemistry
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Pipelines
Residual stress
Studies
Temperature
Ultrasonic imaging
Ultrasonic technology
Welding
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Summary:Pipelines and metal structures in NPP are joined together by means of welding. Welding has signicant advantages, such as saving of metal due to more complete use, reduction of structural mass, and creation of hermetic joints. The operational characteristics of a weld joint are lower than that of the base metal, so that the structural integrity depends on the condition of the weld seam. The degradation of weld joints is due to rapid crystallization of the metal in a weld joint owing to rapid cooling compared with a metal ingot, so that adverse thermal strain and physicochemical and metallurgical processes that affect the joints mechanical properties can occur. A weld joint must undergo treatment in order for its performance to improve. Several methods are available for treat weld seams: thermal tempering and vibrational and deformational methods.
ISSN:1063-4258
1573-8205
DOI:10.1007/s10512-016-0163-2