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Investigating the Weld Strength of AA7075 Aluminium Alloy for TIG, MIG and FSW Welding

The main objective of this work is to compare the weld strength of AA7075 aluminium alloy by conducting tensile test and impact test for various welding like TIG, MIG and FSW. Aluminium is one of the lightest available commercial metals with a density approximately one third that of steel or copper, thus making it the most earnestly used metal for Catamaran ferries, petroleum tankers and aircrafts. Having so many welding methods for joining AA7075 alloy, it is still unclear as to which welding method gives the better weld strength. This study shows the best suitable method of welding for AA7075 aluminium alloy for the suitable conditions specified. ANOVA is done to find the parameters that have highest influence on weld strength. The result shows that the parameter that has highest influence on weld strength is axial force.