Abstract
Aluminum is widely used in lightweight structures and equipments due to its high strength to weight ratio. Fusion welding processes are extensively used as joining process during fabrication of aluminum alloy structures. Joints produced by fusion welding processes exhibit poor joint efficiency and inferior mechanical properties compared to base metal. Weld distortion is a serious issue associated with fusion welding of groove joints. In present work, mechanical, microstructural characterisation of butt joint of Al-5083-H111 executed by Autogenous TIG (Tungsten Inert Gas) welding process is evaluated. Tensile test, microhardness measurement, optical microscopy and fractography study by SEM (Scanning Electron Microscope) is used for weld joint characterisation. Macro observation of sectioned specimen across the weld reveals complete overlap of each weld passes which ensures full penetration weld joint in 6 mm thick square butt joint configuration having zero root gap. Approximately 5% reduction in ultimate tensile strength of the weld joint is reported compared to base metal. Autogenous mode of welding is advantageous in controlling weld distortion because of square butt joint configuration and welding can be completed by performing a smaller number of passes.
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