Enhanced the mechanical properties of aluminium alloy 6061 of welding parts by T6 heat treatment process

Yomli, Sofia Mulyani (2018) Enhanced the mechanical properties of aluminium alloy 6061 of welding parts by T6 heat treatment process. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The main objective of this study is to investigate the effect of T6 heat treatment parameters on the mechanical properties of welding part. The welding process used is Gas Metal Arc Welding (GMAW). The raw material used in this project is Aluminium Alloy 6061 and welded by using the KUKA robotic welding machine. There are four most important parameters of T6 heat treatment process that have been identified, which are Temperature of SHT, Time of SHT, Temperature of Ageing and Time of Ageing. The experiment is designed by using Design of Experiment (DOE) which is Taguchi method. Taguchi method and Analysis of Variance (ANOVA) are used to optimize and validate the heat treatment parameters. After that, the workpiece is cut into ten samples with required dimensions in a dumbbell shape specimen by using wire EDM machine. Next, all of the ten samples went through T6 heat treatment process which were solid solutioning, quenching and artificial ageing with required parameters. Then the tensile test is conducted to observe the Ultimate Tensile Strength, tensile modulus and also percentage elongation. The value of Ultimate Tensile Strength obtained for original welded sample which is without heat treatment is 89.3429 MPa while the maximum Ultimate Tensile Strength value can be attained for welded sample with heat treatment is 231.964 MPa. Next, the microstructure of the sample that has been heat treated is observed by using an optical microscope. It is to observe the grain size of weldment area and base metal. Lastly, the Vickers hardness test is conducted to observe the hardness value which is measured to organize the revolution of mechanical property of weldment area. The hardness value of original welded sample which is without heat treatment is 69.83 V and the hardness value of welded sample with heat treatment is 105.17 V.

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