Repair of Damages that Occurred on the Welded Joints at the Body of Guide Vane Apparatus Vanes of the Vertical Kaplan Turbine

Miodrag Arsić; Srđan M. Bošnjak; Vencislav Grabulov; Mladen Mladenović; Zoran Savić

doi:10.4028/www.scientific.net/AMR.1153.1

Paper Titles

Repair of Damages that Occurred on the Welded Joints at the Body of Guide Vane Apparatus Vanes of the Vertical Kaplan Turbine
p.1

Technical Characteristics of the Equipment for Friction Stir Welding (FSW), Depending on the Base Metals
p.7

Temper Bead Welding, a Possible Solution to Possible Removal of Heat Treatments
p.16

The Welded Structural Designer and the Decision-Making Process in Specific Critical Details Dynamically Loaded Welded Structures Susceptible to Fatigue
p.21

General Aspects Concerning Possibilities of Joining by Friction Stir Welding for some of Couples of Materials Usable in the Automotive Industry
p.27

Feasibility Analysis for Repair of Large Diameter Hydro Turbine Shaft Based on Weldability Test and Welding Cycle Simulation
p.36

Research on Metallurgic Active Precursors
p.46

Activating Precursors for Brazing Processes that Deposit Two Layers through Melting
p.52

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1153Repair of Damages that Occurred on the Welded...

Repair of Damages that Occurred on the Welded Joints at the Body of Guide Vane Apparatus Vanes of the Vertical Kaplan Turbine

Abstract:

Vertical Kaplan turbines, with nominal power of 178 MW and manufactured in Russia, have been installed in 6 hydroelectric generating units of hydro power plant ’Djerdap 1’. Experimental tests were carried out by non-destructive methods in order to determine the turbine condition during the rehabilitation of the hydro power plant. Lack of root penetration was detected in V40 welded joints between upper and lower sleeves and bodies of guide vane apparatus vanes. Height of the lack of root penetration was in the range between 5 and 15 mm, while the allowable height of the lack of root penetration is 3 mm, according to the technical conditions. The upper sleeves were made of cast steel 25L (in accordance with GOST 977), while lower sleeves were made of steel forging St 25 (in accordance with standards GOST 1050 for chemical composition and GOST 8479 for forgings).Methodology for the repair of non-penetrated welded joints between the sleeves and body of the guide vane apparatus vane was composed taking into account the results of ultrasonic testing. By repair methodology it is necessary to, due to the structural solution and service function of guide vane apparatus vanes, specify a large number of details, consider them carefully and carry them out in order to improve safety, because if some of them get overlooked, underestimated or incorrectly perceived, significant problems in turbine operation may occur.This methodology refers solely to the repair of damaged welded joints between sleeves and bodies of guide vane apparatus vanes.

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Periodical:

Advanced Materials Research (Volume 1153)

Pages:

1-6

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1153.1

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Online since:

May 2019

Authors:

Miodrag Arsić*, Srđan M. Bošnjak, Vencislav Grabulov, Mladen Mladenović, Zoran Savić

Keywords:

Guide Vane Apparatus Vane, Lack of Root Penetration, Repair of Damages, Sleeve

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* - Corresponding Author

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