Post-Weld Oxidation Behavior of AA6061 Al Alloy

Abstract:

Welded AA6061 Al alloy using ER5356 (Al-5Mg) filler was oxidized in flowing air gas for 40hrs at 600oC at a total pressure of approximately 1 atm. The morphology and microstructure of welded joint after exposure was characterized by using optical metallurgy microscopy and Scanning Electron Microscope (SEM). Different oxide morphologies and textures were observed on parent and fusion metal due to the differences of the alloying element. The oxidation mechanism represented a complex reaction occur where the morphology and phase formation of the oxide shows the protective oxide scales showed the protective oxide were developed on parent metal side, meanwhile non-protective oxide scale formed on fusion metal of the welded Al alloy. It can be concluded that the welded area failed to resist oxidation behavior compared to the parent metal. The differ results are discuss in term of microstructure changes caused by high temperature oxidation exposure and alloying element.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 2087-2090
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.2087
• Online since: November 2011
• Authors: Nur Azida Che Lah, Azman Jalar, Norinsan Kamil Othman
• Keywords: AA6061 Aluminum Alloy, ER5356 Filler Metal, Morpholoy, Oxidation, Welding

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