This research aim to determine the chemical composition of the aluminum alloys, udmicrostructure, hardness and impact strength before and after MIG welding method on the udaluminum cast wheel. The electrodes used in the welding process is ER 535.udThe material used in this study is aluminum cast wheel with specifications:uddimensions 16x7, PCD 4x120 product type of E35. The testing methods conducted in this udstudy are chemical composition, microstructure test, hardness test and impact test. The udequipment used are Spectrometer Metal Scan, Olympus Metallurgycal Microscope, Brinell udHardness Tester and Charpy Tester.udThe test results showed that the chemical composition of the aluminum cast wheel udcontains elements of 91.36% Al, 7.38% Si, and 0.803% Fe as well 0.05% Cu and Mg. The test udresults show that the microstructure of Al grain structure in the HAZ region fused with udprimary aluminum (α-Al) and grain Si Si alloy formed between the primary α-Al. The results udof hardness test show that in the raw materials specimens is 57.56 kgf/mm², in the weld area udis 44.20 kgf/mm² and the HAZ is 37.73 kgf/mm². The results of impact test on the raw materialudis 0.118 Joule/mm², while the weld area is 0.067 Joules/mm². The results of the test show that, udhardness and impact strength due to welding less than the raw material on the aluminum cast udwheel.udKeywords: Cast wheel, aluminium welding, MIG welding, repair welding, material testing.
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