Phase based Study of Solidified Structures evolved during the TIG welding of 2219-T87 Aluminum Alloy

W. Ahmad, G. H. Awan, T. Ahmad, M. T. Z. Butt, L. A. Kasuri, M. Kamran

Abstract


Aluminum alloys particularly 2219 is being abundantly used in aerospace industry due to high strength to weight ratio and excellent weldability. After welding, the sudden reduction in mechanical properties of joint as compared to that of the parent metal is a serious issue in fabrication industry. In this research work, a comparative study has been made to investigate the dependence of mechanical properties on variation of filling material composition and resultant microstructure developed in a square butt joint of 2219 aluminum alloy plates welded by tungsten inert gas (TIG) welding process using different filler materials including ER-2319, ER-4043 and ER-5356. The variation in hardness and ultimate tensile strength values was correlated with the grain morphology, composition, morphology and volume of eutectic phase along the grain boundaries found in base metal (BM), heat affected zone (HAZ) and weld zone (WZ).It was observed that ER-2319 WZ gives better properties due to its compatible primary and eutectic phases. However ER-5356 WZ showed poor compatibility due to porosity formation and variation of microstructure within the WZ.


Keywords


Microstructure, TIG welding, Filler Alloys, Metallography, Scanning Electron microscopy



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