A new alloy, designated AA2519, has replaced AA2219 Al in an effort to increase its strength-to-weight ratio and ballistic resistance. In general, the main issues that arise during welding are the production of oxide layers, solidification cracking, and porosity. Given the foregoing, it is proposed for the current effort to examine how the welding process affects mechanical qualities, corrosion behaviour, and microstructural changes. The current work combined friction stir welding (FSW) and gas tungsten arc welding (GTAW) to weld 10mm thick plates of the AA2519 Al-alloy. Potentiodynamic polarisation tests were performed in the aqueous solution of 3.5 percent NaCl in an aerated atmosphere in order to evaluate the pitting corrosion behaviour. Investigations on exfoliation corrosion utilising the EXCO solution are carried out for various time lapses. The study shows that AA2519 FS welds outperform GTA welds in terms of mechanical and corrosion resistance. In order to provide the mechanism for a better combination of hardness and corrosion resistance, undissolved strengthening precipitates such as Al2CuMg, Al3Zr, and Al3Ti were developed. These fortifying precipitates provide the insulation pathways for the production of galvanic cells between the Al2Cu and -Al matrix.
Author(s) Details:
G. Siva Prasad,
Department of Metallurgical Engineering, Andhra University, Visakhapatnam, Andhra Pradesh, India.
K. Srinivasa Rao,
Department of Metallurgical Engineering, Andhra University, Visakhapatnam, Andhra Pradesh, India.
G. Madhusudhan Reddy,
Defence Metallurgical Research Laboratory, Hyderabad, India.
Please see the link here: https://stm.bookpi.org/TIER-V7/article/view/7926
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