Effect of Welding Processes of Mechanical and Metallurgical Properties of AA6061

Arun M¹, Ramachandran K²

^1,2NSN College of Engineering and Technology, India

Abstract

The preferred welding process for high strength aluminium alloy are frequently Gas Metal Arc Welding (GMAW) and Gas Tungsten Arc Welding (GTAW) due to their comparatively thicker sections of aluminium alloys in several fields, such as pressure vessels structural columns and a transport systems necessitates multi pass welding for joining of those section. Compared to many of fusion welding processes that are routinely used for joining structural alloys, FSW is an emerging solid state joining process in which the material that is being welded does not melt and recast. Therefore, when alloys are friction stir welded, phase transformations that occur during the cool down of weld are of a solid state type due to absence of parent metal melting, the new FSW process is observed to offer several advantages over fusion welding. In this investigation, AA 6061 aluminium alloy sheets of 6 mm thickness has been welded by three different processes, such as, Friction Stir Welding (FSW), Gas Tungsten Arc Welding (GTAW) and Gas Metal Arc Welding (GMAW) welding process. In friction stir welding there is no addition to filler material but in GTAW and GMAW process AA4043 (Al-5% Si) has been used as filler material. Tensile properties such as yield strength, tensile strength, and (%) elongation have been evaluated for all the joints. Microstructure analysis and Micro-hardness survey have been carried out. Tensile and hardness of all the weldmesh have been compared and correlated with microstructure. The main objectives of the present investigation are studying the walkability of AA 6061 alloy by friction stir welding process. Evaluating the mechanical (Tensile and Hardness) and metallurgical properties (Micro-structure) of friction stir welded aluminium alloys and comparing the properties of FSW with GMAW and GTAW process.

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Cite this Article as Follows

Arun M, Ramachandran K. "Effect of Welding Processes of Mechanical and Metallurgical Properties of AA6061." International Conference on Intelligent Computing and Systems (2017): 08. Print.