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Title: Study of welding parameters on mechanical and corrosion properties of cupro nickel alloys Cu Ni
Researcher: Chakravarthy, Maddilli Praveena
Guide(s): Sundara, S K Siva Rao
Ramaniah, N
Keywords: Mechanical Engineering
Cupronickel alloys
Welding parameters
Upload Date: 18-Dec-2013
University: Andhra University
Completed Date: May 2013
Abstract: Presently, welding of 90/10 and 70/30 Cu-Ni alloys in ship building industries can be performed adequately only by GTAW which uses ER Cu-Ni 70/30 filler wire. Earlier investigations explained on CC GTAW of 70º-80º single V butt 90/10 Cu-Ni alloys welds revealed excessive grain size in FZ and HAZ. This large grain size tends to promote ductility-dip cracking, distortion, hot cracking sensitivity, increase in width of HAZ and residual stresses. Because of the above mentioned problems, CC GATW of Cupronickel alloy welds exhibits inferior mechanical properties. The objective of the present work is to investigate the effects of the various welding parameters on the welding quality of PC GTAW of 90/10 and 70/30 Cu-Ni alloy welds and to obtain the optimal sets of welding parameters so that the quality of welding can be enhanced. In this, firstly investigation on CC GTAW and PC GTAW of 90/10 and 70/30 Cu-Ni alloy welds with same filler wire ERCu-Ni (70/30) is made use for both the welding techniques and alloys. Identification of PC GTAW process parameters such as Peak Current (PC), Base Current(BC), Pulse frequency(PF) and Welding speed(WS) and considering four levels from each welding parameter such as 200A,210A,220A,and 230A for PC, 95A,105A,115A, and 125A for BC, 0.5Hz,1Hz,3Hz,and 5Hz for PF and 140 mm/min,150 mm/min,160 mm/min, and 170 mm/min for WS.. Taguchi s method of approach to design of experiment has been used during optimization of selected parameters and levels for predicting the ultimate tensile strength (UTS) of the PC GTAW joints at 95% confidence level. Analysis of variance (ANOVA) conformation test was carried out for analysing the predicted ultimate tensile strength values obtained from Taguchi method with that of the experimental values of PC GTAW of 90/10 and 70/30 Cu-Ni alloy welds. Experiments were conducted to observe the influence of PC GTAW process parameters on mechanical properties and microstructures of 90/10 and 70/30 Cu-Ni alloy welds.
Pagination: xix, 143p.
Appears in Departments:Department of Mechanical Engineering

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01_title.pdfAttached File25.2 kBAdobe PDFView/Open
02_dedication.pdf12.27 kBAdobe PDFView/Open
03_declaration.pdf63.07 kBAdobe PDFView/Open
04_certificate.pdf65.43 kBAdobe PDFView/Open
05_acknowledgements.pdf90.07 kBAdobe PDFView/Open
06_abstract.pdf182.16 kBAdobe PDFView/Open
07_list of figures.pdf215.71 kBAdobe PDFView/Open
08_list of tables.pdf113.32 kBAdobe PDFView/Open
09_nomenclature.pdf178.98 kBAdobe PDFView/Open
10_contents.pdf123.14 kBAdobe PDFView/Open
11_chapter 1.pdf201.54 kBAdobe PDFView/Open
12_chapter 2.pdf418.68 kBAdobe PDFView/Open
13_chapter 3.pdf187.38 kBAdobe PDFView/Open
14_chapter 4.pdf847.33 kBAdobe PDFView/Open
15_chapter 5.pdf3.43 MBAdobe PDFView/Open
16_chapter 6.pdf158.89 kBAdobe PDFView/Open
17_references.pdf234.34 kBAdobe PDFView/Open
18_list of publications.pdf99.93 kBAdobe PDFView/Open

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