Optimization of induction brazing parameters for stellite strip of steam turbine blade using Taguchi-neural network

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Publication Details

Author list: Muangsong N., Wongsa S., Phung-On I.

Publisher: Trans Tech Publications

Publication year: 2013

Volume number: 545

Start page: 225

End page: 229

Number of pages: 5

ISBN: 9783037856321

ISSN: 1013-9826

eISSN: 1662-9795

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876214819&doi=10.4028%2fwww.scientific.net%2fKEM.545.225&partnerID=40&md5=89aed8cc4e2b2599e4fc508923b2ad38

Languages: English-Great Britain (EN-GB)

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Abstract

To repair the damaged of steam turbine blades, the method of increasing wear resistance of the blade leading edge with brazing of stellite plates by induction heating has been addressed in this work. Induction brazing of a Cobalt-based alloy to SUS410Cb steam turbine blades in an electrical power plant has been carried out. Ag-Cu-Zn based material was chosen to be the filler metal sandwiched between the stellite strip and the turbine blade. In order to cope with the large size of blades, an automatic brazing process which used moving induction coils has been developed. In the proposed brazing process, there are three parameters that significantly affect the quality of the brazing joints including coil distance, moving coil speed, and power of induction heating. In this work, the optimum choice of brazing parameters is obtained by using a Taguchi-neural network technique. According to the results of our previous work, it is recommended to attain the temperature distribution at around 750ฐC for maximum strength and good quality brazing in the brazed components. The objective for the evaluation of brazing quality is therefore a function of this temperature and defined as the temperature deviation from the best brazing temperature. The design is verified and confirmed by the manufacturing of brazed joint applying suggested parameters. The experimental results showed that the Taguchi-Neural network method resulted in a better brazed quality than when using only the Taguchi method. ฉ (2013) Trans Tech Publications.

Keywords

Induction brazing, Taguchi method, Turbine blade