The Effect Of Bobbin Friction Stir Welding Repetition Process On The Microstructure Of The Aluminium Alloy 1100

Vellasamy, Yuwendran (2019) The Effect Of Bobbin Friction Stir Welding Repetition Process On The Microstructure Of The Aluminium Alloy 1100. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The material used as a work piece to be joined in this study is Aluminium alloy 1100. Aluminium alloy 1XXX is a pure form of aluminium as it contains minimum 99.00 % of aluminium. Bobbin friction stir welding (BSFW) is compatible for welding AA 1100 as it is an environmental friendly process that reduce the production of heat and pollution. The problem for this study is to understand the modification in characteristic of material when multipass method utilized. Moreover, another challenge is for determining the capability of multipass for repairing joint by rejoin. In addition, connection between mechanical property of a material and metallurgical properties need to be determined for analyzing the ability of multipass for producing good weld joint. Methods for solving the problem is by conducting the experiment to identify improvement of in characteristic of material by multipass and discover at which number of passes will produce joint with high quality. The same method will be useful for determining whether multipass can help for rejoining of weld for the joint produced. Furthermore, metallurgical method done for examining metallurgical property of sample. Metallurgical method used for the study is optical microscope (OM) and scanning electron microscope (SEM) for observing the microstructure evolution and also software known as ImageJ used for determining the grain size. Microhardness machine utilized for analyzing the hardness of sample and ultimate tensile strength test also carried out. After performing the study, expected outcome is determination of which number of passes can improve material characteristic and also for repairing the joint. Then, correlation between mechanical property and metallurgical property can be made based on the study carried out. Thus, by using (BSFW) process that introduce low heat will make it as a suitable solid-state welding process for AA 1100.

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