Modeling and analysis of ferrite number of stainless steel gas tungsten arc welded plates using response surface methodology

  • R. Sudhakaran
  • V. VeL Murugan
  • P. S. Sivasakthivel
  • M. Balaji


The prediction of delta ferrite content expressed in terms of ferrite number in austenitic stainless steel welds is very helpful in assessing its performance. The final ferrite content determines the properties of weldments such as strength, toughness, corrosion resistance, and phase stability. This paper presents a study on the effect of process parameters on ferrite number in 202 grade stainless steel gas tungsten arc welded plates (GTAW). Experiments were conducted based on response surface methodology. The ferrite number was determined by using a ferrite scope and by using DeLong diagram. A mathematical model was developed correlating the important controllable GTAW process parameters like welding gun angle, welding speed, plate length, welding current, and shielding gas flow rate with ferrite number. The adequacy of the model was checked using analysis of variance technique. The developed model is very useful to quantitatively determine the ferrite number. The main and interaction effects of the process parameters are presented in graphical form that helps in selecting quickly the process parameters to achieve the desired results.


Ferrite number GTAW Response surface methodology Analysis of variance 


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Copyright information

© Springer-Verlag London Limited 2012

Authors and Affiliations

  • R. Sudhakaran
    • 1
  • V. VeL Murugan
    • 2
  • P. S. Sivasakthivel
    • 3
  • M. Balaji
    • 1
  1. 1.Department of Mechanical EngineeringKumaraguru College of TechnologyCoimbatoreIndia
  2. 2.Sree Sakthi Engineering CollegeCoimbatoreIndia
  3. 3.School of Mechanical EngineeringSASTRA UniversityThanjavurIndia

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