Modeling and Optimization the Effect of TIG Welding Parameters on the Corrosion Resistance of 2205 DSS Weldments Using Electrochemical Impedance Technique

Mohamed S.  Melad; Mohamed  Gebril; Farag M.  Shuaeib; Dawod  Elabar; Farag I.  Haidar

doi:10.64516/60hjv976

Authors

Mohamed S. Melad Mechanical Engineering Department, Faculty of Engineering, University of Benghazi Author
Mohamed Gebril Mechanical Engineering Department, Faculty of Engineering, University of Benghazi Author
Farag M. Shuaeib Mechanical Engineering Department, Faculty of Engineering, University of Benghazi Author
Dawod Elabar Mechanical Engineering Department, Faculty of Engineering, University of Benghazi Author
Farag I. Haidar Mechanical Engineering Department, Faculty of Engineering, University of Benghazi Author

DOI:

https://doi.org/10.64516/60hjv976

Keywords:

Duplex stainless steel, TIG welding process, N2 as shielding gas, Response surface method, Electrochemical impedance technique

Abstract

Duplex stainless steel has a high mechanical properties and good corrosion resistance due to the percentage of alloying elements and the almost equal amount of austenite and ferrite phase. Most DSS applications require welding processes to joint parts together. The carry out welding process affects the microstructure of DSS and leads to formation of the precipitations resulting in poor mechanical properties and corrosion resistance. In this study, the effect of tungsten inert gas TIG welding parameters namely welding current WC, welding speed WS, and N2 addition with Ar as shielding gas on the corrosion resistance have been investigated. The corrosion penetration rate of the DSS weldments determined using electrochemical impedance technique. The response surface methodology was applied in order to achieve the mathematical model that describes the relationship between welding variables and corrosion penetration rate. Results showed that the WC and WS are the most important parameters that affected the corrosion penetration rate. The results clarified that when increasing WC with decreasing WS which means highest heat input the corrosion penetration rate increase due to the appearance of the precipitations; while the decreasing in WC with increasing in WS which means low heat input the corrosion penetration rate also increase due to the increase in ferrite content. The results also found that the addition of a few amount of N2 with Ar as shielding gas leads to decrease the corrosion penetration rate, but when increase the amount of N2 more than 10% leads to increase the corrosion penetration rate due to the reappearance of the precipitations.

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