Influence of shielding gas on the mechanical and metallurgical properties of DP-GMA-welded 5083-H321 aluminum alloy |
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| Authors: | Amin Reza Koushki Massoud Goodarzi Moslem Paidar |
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| Affiliation: | 1. Department of Metalurgy and Materials Engineering, Iran University of Science and technology, Tehran, Iran;2. Department of Materials Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran |
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| Abstract: | In the present research, 6-mm-thick 5083-H321 aluminumalloy was joined by the double-pulsed gas metal arc welding (DP-GMAW) process. The objective was to investigate the influence of the shielding gas composition on the microstructure and properties of GMA welds. A macrostructural study indicated that the addition of nitrogen and oxygen to the argon shielding gas resulted in better weld penetration. Furthermore, the tensilestrength and bending strength of the welds were improved when oxygen and nitrogen (at concentrations as high as approximately0.1vol%) were added to the shielding gas; however, these properties were adversely affected when the oxygen and nitrogen contents were increased further. This behavior was attributed to the formation of excessive brown and black oxide films on the bead surface, the formation of intermetallic compounds in the weld metal, and the formation of thicker oxide layers on the bead surface with in-creasing nitrogen and oxygen contents in the argon-based shielding gas. Analysis by energy-dispersive X-ray spectroscopy revealed that most of these compounds are nitrides or oxides. |
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| Keywords: | aluminumalloys gas metal arc welding shielding gas mechanical properties metallurgical properties |
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