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Effect of modified AA4043 filler on corrosion behavior of AA6061 alloy GTA welds

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Abstract

The corrosion behavior of the fusion zone of gas tungsten arc (GTA) welds of AA6061 alloy was studied. The role of GTA welding techniques such as continuous current and pulsed current (PC) with reference filler (AA4043) was studied. The role of the addition of different grain refiners such as scandium (Sc), zirconium, and Tibor to the reference filler was studied. Dynamic polarization testing was used to determine the pitting corrosion resistance of the fusion zone. Optical microscopy and scanning electron microscopy studies were carried out to find the mechanism of corrosion. Out of all the grain refiners studied, better corrosion resistance was observed with 0.5 % Sc addition to fusion zone through reference filler and PC technique.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Andhra University College of Engineering (A), Viskhapatnam, 530 003, Andhra Pradesh, India

    N. Ramanaiah

  2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Indian Institute of Technology Madras, Chennai, 600036, India

    K. Prasad Rao

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  1. N. Ramanaiah
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  2. K. Prasad Rao
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Correspondence to N. Ramanaiah.

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Ramanaiah, N., Prasad Rao, K. Effect of modified AA4043 filler on corrosion behavior of AA6061 alloy GTA welds. Int J Adv Manuf Technol 64, 1545–1554 (2013). https://doi.org/10.1007/s00170-012-4121-4

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  • DOI: https://doi.org/10.1007/s00170-012-4121-4

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