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Abstract
Friction Stir Welding (FSW) produces higher quality welds with fewer defects like porosity, and cracking and material properties closer to the parent metal as compared to most other welding processes. A solid state process which is particularly suitable for welding aluminum. The Friction Stir Welding (FSW) can overcome the difficulties in conventional welding of aluminum alloys. A non-consumable tool is used to generate frictional heat in the abutting surfaces. A shoulder and a pin are the important parts of the tool. This tool makes weld without conventional defects with good mechanical properties and is especially suited for defense applications. The aim of present study is to determine the difference between the hardness and tensile strength of the aluminum alloys Al7075 and Al6061 with 6mm thick plates and to compare the FSW welding with TIG welding of the same materials.