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Arabian Journal for Science and Engineering

, Volume 44, Issue 2, pp 1617–1630 | Cite as

Optimization of Melt Zone Area for Electron Beam Welded Hastelloy C-276 Sheet and Study of Corrosion Resistance of the Optimized Melt Zone in 3.5 wt% NaCl Aqueous Solution

  • Kalinga Simant Bal
  • Jyotsna Dutta Majumdar
  • Asimava Roy ChoudhuryEmail author
Research Article - Mechanical Engineering
  • 22 Downloads

Abstract

Hastelloy C-276 superalloy has a wide range of applications including petroleum and petrochemical industries. Since welding forms an essential fabrication method for joining different structures in these industries, selection of suitable welding parameters is a prime concern that is yet to be addressed for Hastelloy C-276. In the present study, optimization of process parameters for electron beam welding of 2.6-mm-thick Hastelloy C-276 sheet has been carried out to obtain weld bead having through-penetration and minimum weld (or melt) zone cross-sectional area. A simple optimization technique is employed in the present study to solve the multi-objective minimization problem. After carrying out the full factorial experiment using selected process parameters, various geometric elements of the weld bead are identified as the output responses. The regression equation is developed for each geometric element from the experimental data. The desired value of a geometric element is specified as a constraint for the corresponding regression equation. A number of regression equations (considering all the geometric elements) are solved in parallel to obtain an optimized set of process parameters, followed by a confirmation test. Further, the optimized melt zone is subjected to cyclic potentiodynamic polarization test to study its susceptibility to localized corrosion. It is observed that polarization curve characteristics of base metal and optimized melt zone are not significantly different; however, the repassivation potential of the melt zone is less than that of the base metal. A flowchart showing the layout of the employed optimization technique followed by corrosion test is attached.

Keywords

Hastelloy C-276 Electron beam welding Optimization Full factorial design Regression equation Cyclic potentiodynamic polarization test 

List of symbols

EBW

Electron beam welding

Wire EDM

Wire electrical discharge machining

TT

Total throat

CW

Crown width

RW

Root width

\({\theta }_{1}\)

\(\hbox {Angle}_{1}\)

\({r}_{1}\)

\(\hbox {Radius}_{1}\)

\({\theta }_{2}\)

\(\hbox {Angle}_{2}\)

\({r}_{2}\)

\(\hbox {Radius}_{2}\)

NW

Neck width

B

Parallelogram height

K

Polynomial profile height

\({\theta }_{3}\)

\(\hbox {Angle}_{3}\)

\({r}_{3}\)

\(\hbox {Radius}_{3}\)

MZA

Melt zone area

V

Accelerating voltage \(({\mathrm {Factor}}_{1}\, \mathrm {or}\, {\mathrm {Main}\, \mathrm {effect}}_{1})\)

C

Beam current \(({\mathrm {Factor}}_{2}\, \mathrm {or}\, {\mathrm {Main}\, \mathrm {effect}}_{2})\)

S

Scanning speed \(({\mathrm {Factor}}_{3}\, \mathrm {or}\, {\mathrm {Main}\, \mathrm {effect}}_{3})\)

\(V_{1}\)

First level of accelerating voltage

\(V_{2}\)

Second level of accelerating voltage

\(C_{1}\)

First level of beam current

\(C_{2}\)

Second level of beam current

\(S_{1}\)

First level of scanning speed

\(S_{2}\)

Second level of scanning speed

\(k_{0_{i}}\)

Regression constant for ith output response, where \({i} = 1, 2, 3,\ldots , 13\)

\(k_{m_{i}}\)

Regression coefficient of mth main (factor) effect and interaction effect for ith output response, where \({m} = 1, 2, 3,\ldots , 7\)

\(R^{2}\)

R-squared (or coefficient of determination)

P value

Probability value (obtained by F test)

AISI

American Iron and Steel Institute

SS

Stainless steel

\({S}_{\mathrm {r}}\)

Scan rate

t

Immersion time before measuring \({E}_{\mathrm {OCV}}\)

\({E}_{\mathrm {OCV}}\)

Open-circuit potential

OCV

Open-circuit voltage

\({E}_{\mathrm {i}}\)

Starting scan potential

\({I}_{\mathrm {r}}\)

Reverse scan current

\({E}_{\mathrm {f}}\)

End scan potential

\({\rho }\)

Density of Hastelloy C-276

\({E}_{\mathrm {REF}}\)

Reference electrode potential

\({E}_{\mathrm {Corr}}\)

Corrosion potential

\({E}_{\mathrm {Prot}}\)

Protection potential

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Notes

Acknowledgements

The authors are very grateful to all the faculty members, technical staffs and research scholars of Department of Metallurgical & Materials Engineering, Department of Mechanical Engineering and Central Research Facility, I.I.T. Kharagpur, for extending their support to carry out various experiments. The authors would like to thank Mr. Rajib Chakraborty, research scholar of Department Mechanical Engineering, I.I.T. Kharagpur, for extending kind support in carrying out the corrosion experiment.

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • Kalinga Simant Bal
    • 1
  • Jyotsna Dutta Majumdar
    • 2
  • Asimava Roy Choudhury
    • 1
    Email author
  1. 1.Department of Mechanical EngineeringIndian Institute of Technology, KharagpurKharagpurIndia
  2. 2.Department of Metallurgical and Materials EngineeringIndian Institute of Technology, KharagpurKharagpurIndia

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