PENGARUH FREKUENSI GETARAN TERHADAP SIFAT FISIS DAN MEKANIK PADA SAMBUNGAN LAS MIG ALUMINIUM PADUAN AA 6061-T6

Abstract

AA 6061-T6 aluminium alloy is one of the 6xxx series that is widely used in engineering, especially automotive, aircraft, piping, and shipbuilding industries because it has many advantages. Despite AA 6061-T6 has a relatively good weldability, the strength of the weld joints is lower compared to its AA6061-T6 base metal. Therefore, this study aims to improve mechanical properties of metal inert gas (MIG) welded AA 6061-T6 aluminium alloy plates such as hardness and tensile strength by introducing engineering vibration during welding at a frequency of 100 Hz. The MIG welding process was conducted using current (I), voltage (E) and welding speed (v) of 120 Ampere, 20 Volt and 12 mm/minute respectively with filler metal used was ER5356. Results showed that the ultimate tensile strength of the weld joints increased under vibrational treatment with the tensile strength achieved 172.02 MPa which was 49% higher compared to conventional weld joint. The higher strength of the vibrated weld joints could be linked to the weld microstructure which consisted of fine grained equiaxed-dendritic structures.