Effect of Welding Speed on the Microstructure and Corrosion Properties of Weld and Heat Affected Zones in GTA Welded AA2014 Alloy

Abstract:

The microstructure and corrosion properties of weld fusion zone and the heat affected zones of gas tungsten arc (GTA) welded AA2014 alloy, welded at varying speeds of 1.5mm/s, 2.5 mm/s and 3.5 mm/s were examined for gaining knowledge on the effect of welding speed on corrosion behavior at localized regions of the weldment. The macrostructure and microstructure of the welds were evaluated with optical microscope. The corrosion properties were examined with potentiodynamic polarization in aqueous 3.5% NaCl solution. The GTA welding has resulted in grain refinement fusion zone and dispersion of coarse Al₂Cu phases within the grains and along the grain boundaries of heat affected zones. With increase in welding speed the grain size of AA2014 at the fusion zone reduces significantly and also the corrosion resistance of the fusion zone and heat affected zone could decrease as it shows higher negative corrosion potential.

• Periodical: Materials Science Forum (Volume 969)
• Pages: 834-838
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.969.834
• Online since: August 2019
• Authors: M.P. Shankar, R. Sokkalingam, Bhavani Kosuri, Katakam Sivaprasad*, V. Muthupandi
• Keywords: AA2014 Alloy, Corrosion Testing, Gas Tungsten Arc Welding, Optical Microscopy

References

[1] X. Zhang, T. Hashimoto, J. Lindsay, X. Zhou, Investigation of the de-alloying behaviour of θ-phase (Al2Cu) in AA2024-T351 aluminium alloy, Corrosion Science, 108 (2016)85-93.

DOI: 10.1016/j.corsci.2016.03.003

[2] P. Sharma, P. Chandel, V. Bhardwaj, M. Singh, P. Mahajan, Ballistic impact response of high strength aluminium alloy 2014-T652 subjected to rigid and deformable projectiles, Thin-Walled Structures, 126(2018) 205-219.

DOI: 10.1016/j.tws.2017.05.014

[3] R. Sokkalingam, K. Venkatesan, S. S. Sabari, S Malarvizhi and V Balasubramanian, Effect of Post Weld Aging Treatment on Tensile Properties Of GTAW Welded Armour Grade AA2519-T87 Aluminium Alloy Joints, International Journal of Research in Engineering and Technology 3(11) 316-320.

DOI: 10.15623/ijret.2014.0323069

[4] Q. Pan, C. Huang, L. Li, Part-through fracture toughness (KIe) and crack-tip opening displacement (CTOD) of welded joints of AA2014-T6 at low temperatures, Cryogenics 71 (2015) 55–61.

DOI: 10.1016/j.cryogenics.2015.05.009

[5] P. W. Li, H. Z. Li, L. Huang, X.P. Liang, Z.X. Zhu, Characterization of hot deformation behavior of AA2014 forging aluminum alloy using processing map, Trans. Nonferrous Met. Soc. China 27(2017) 1677 −1688.

DOI: 10.1016/s1003-6326(17)60190-0

[6] M.P. Shankar, R. Sokkalingam, K. Sivaprasad, V. Muthupandi, Effect of Electrolyte on Micro Arc Oxidation Coating of Al-2014 Alloy, Advanced Materials Research, 1148 (2018), 159-164.

DOI: 10.4028/www.scientific.net/amr.1148.159

[7] W.L. Burch, E. A. Dolega and G.F. Kappelt, Fusion welding of 2014 aluminium alloy, Bell laboratory report, Revision A (1962).

[8] V. Gadpale, P. N. Banjare, M. K. Manoj, Effect of ageing time and temperature on corrosion behaviour of aluminum alloy 2014, IOP Conf. Series: Materials Science and Engineering 338 (2018) 012008.

DOI: 10.1088/1757-899X/338/1/012008

[9] S. Sinhmar and D. K. Dwivedi, A study on corrosion behavior of friction stir welded and tungsten inert gas welded AA2014 aluminium alloy, Corrosion Science, 133 (2018) 25-35.

DOI: 10.1016/j.corsci.2018.01.012

[10] A. F. Norman, V. Drazhner, P. B. Prangnell, Effect of welding parameters on the solidification microstructure of autogenous TIG welds in an Al–Cu–Mg–Mn alloy, Materials Science and Engineering: A, 259(1) (1999) 53-64.

DOI: 10.1016/s0921-5093(98)00873-9