Effect of Welding Process on Microstructure and Pitting Corrosion Behavior of AA2014 Al-Cu Alloy Welds
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Authors
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Department of Mechanical Engineering, GITAM Institute of Technology, GITAM University, Visakhapatnam - 530045 ,IN
V. S. N. Venkata Ramana -
Department of Metallurgical Engineering, Government Polytechnic, Visakhapatnam - 530 007 ,INK. Ratna Kumar
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Metal Joining Group, Defence Metallurgical Research Laboratory, Hyderabad - 500 058 ,ING. Madhusudhan Reddy
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Department of Metallurgical Engineering, Andhra University College of Engineering (A), Visakhapatnam- 530 003 ,INK. Srinivasa Rao
DOI:
https://doi.org/10.22486/iwj/2012/v45/i3/141214Keywords:
Gas Tungsten Arc Welding, Friction Stir Welding, AA2014 Alloy, Partially Melted Zone, Thermomechanically Affected Zone, Pitting Corrosion, Potentiodynamic Polarization.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.
