Indian Welding Journal

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Effect of Welding Process on Microstructure and Pitting Corrosion Behavior of AA2014 Al-Cu Alloy Welds


Affiliations
1 Department of Mechanical Engineering, GITAM Institute of Technology, GITAM University, Visakhapatnam - 530045, India
2 Department of Metallurgical Engineering, Government Polytechnic, Visakhapatnam - 530 007, India
3 Metal Joining Group, Defence Metallurgical Research Laboratory, Hyderabad - 500 058, India
4 Department of Metallurgical Engineering, Andhra University College of Engineering (A), Visakhapatnam- 530 003, India
     

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Wrought AA 2014 Al-Cu alloy in mill annealed (O) condition and naturally aged (T4) condition was welded by the Gas Tungsten Arc Welding (GTAW) and Friction Stir Welding (FSW) processes. The microstructural changes and pitting corrosion behaviour in all zones of welds for both the welding processes have been investigated when the alloy was welded in O as well as in T4 conditions. It was observed that naturally aged (T4) alloy weld exhibited better corrosion properties than annealed (O) alloy weld this is attributed to the precipitation of fine grained eutectics in T4 alloy during welding. The pitting corrosion resistance was found to be better and uniform through out cross section of the friction stir welds compared to GTA welds, indicating improvement in corrosion properties of the welds in solid state welding.

Keywords

Gas Tungsten Arc Welding, Friction Stir Welding, AA2014 Alloy, Partially Melted Zone, Thermomechanically Affected Zone, Pitting Corrosion, Potentiodynamic Polarization.
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  • Effect of Welding Process on Microstructure and Pitting Corrosion Behavior of AA2014 Al-Cu Alloy Welds

Abstract Views: 494  |  PDF Views: 4

Authors

V. S. N. Venkata Ramana
Department of Mechanical Engineering, GITAM Institute of Technology, GITAM University, Visakhapatnam - 530045, India
K. Ratna Kumar
Department of Metallurgical Engineering, Government Polytechnic, Visakhapatnam - 530 007, India
G. Madhusudhan Reddy
Metal Joining Group, Defence Metallurgical Research Laboratory, Hyderabad - 500 058, India
K. Srinivasa Rao
Department of Metallurgical Engineering, Andhra University College of Engineering (A), Visakhapatnam- 530 003, India

Abstract


Wrought AA 2014 Al-Cu alloy in mill annealed (O) condition and naturally aged (T4) condition was welded by the Gas Tungsten Arc Welding (GTAW) and Friction Stir Welding (FSW) processes. The microstructural changes and pitting corrosion behaviour in all zones of welds for both the welding processes have been investigated when the alloy was welded in O as well as in T4 conditions. It was observed that naturally aged (T4) alloy weld exhibited better corrosion properties than annealed (O) alloy weld this is attributed to the precipitation of fine grained eutectics in T4 alloy during welding. The pitting corrosion resistance was found to be better and uniform through out cross section of the friction stir welds compared to GTA welds, indicating improvement in corrosion properties of the welds in solid state welding.

Keywords


Gas Tungsten Arc Welding, Friction Stir Welding, AA2014 Alloy, Partially Melted Zone, Thermomechanically Affected Zone, Pitting Corrosion, Potentiodynamic Polarization.



DOI: https://doi.org/10.22486/iwj%2F2012%2Fv45%2Fi3%2F141214