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Lap Joint Dissimilar Welding of Aluminium AA6061 and Galvanized Iron Using TIG Welding

L. H., Shah and U. K., Mohamad and K. I., Yaakob and A. R., Razali and M., Ishak (2016) Lap Joint Dissimilar Welding of Aluminium AA6061 and Galvanized Iron Using TIG Welding. Journal of Mechanical Engineering and Sciences (JMES) , 10 (1). pp. 1817-1826. ISSN 2289-4659 (print); 2231-8380 (online)

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Abstract

In this paper, aluminium AA6061-O and galvanized iron were lap-joined using tungsten inert gas (TIG) welding. The experiments were conducted using Si-rich filler metals ER4043 (Si 5 wt.%) and ER4047 (Si 12 wt.%). The mechanical properties and the microstructure of the samples were analysed using dye penetrant non-destructive tests (NDT), optical microscope observation and shear tests. All samples showed good quality joints, with Al-GI specimens showing better quality. Through optical microscope observation, the intermetallic compounds (IMC) of specimens using ER4043 fillers show a thin IMC layer ranging from 4 µm to 7 µm, compared to ER4047 samples which ranged between 20 µm and 40 µm. The shear tests show that the GI-Al group fractured at the IMC layer, while the Al-GI group fractured at the FZ-HAZ aluminium matrix. The highest shear strength value obtained was 89.82 MPa and 76.59 MPa for the Al-GI and GI-Al positions, respectively. It can be concluded that the GI-Al (galvanized iron on top and aluminium at the bottom) configuration with filler type ER4043 (Si 5 wt.%) has the optimum mechanical properties with a thin IMC layer and tensile strength of 76.59 MPa.

Item Type: Article
Uncontrolled Keywords: Dissimilar welding; TIG welding; aluminium; galvanized iron; microstructure; mechanical properties.
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 21 Dec 2016 06:09
Last Modified: 10 Jan 2018 02:43
URI: http://umpir.ump.edu.my/id/eprint/14435
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