Mechanical Properties and Corrosion Characteristics of Friction Stir Dissimilar Welded Joint Between AA1000 and AA6061-T6 Aluminum Alloys

CHHORN, Sokvisal, Prof. Ir. Mochammad Noer Ilman, S.T., M.Sc., Ph.D., IPM., ASEAN Eng.

2020 | Tesis | MAGISTER TEKNIK MESIN

This thesis is aimed to investigate microstructure, corrosion and mechanical properties of dissimilar metal weld joints between AA1000 and AA6061-T6 under different tool rotational speeds of 910, 1500, and 2280 rpm with the constant transverse speed of 30 mm/min. Several experimental works have been conducted including microstructure observation using optical microscopy and Scanning Electron Microscopy (SEM) equipped with Electron Dispersive x-ray Spectroscopy (EDS), microhardness measurements, tensile tests, and corrosion measurement using Potentiodynamic Polarization method. Results show that increasing tool rotational speed from 910 rpm to 1500 rpm increases the degree of homogeneity in nugget zone and strength of the weld joint but further increase in the tool rotational speed up to 2280 rpm degrade the mechanical properties due to coarsening the microstructure. Furthermore, corrosion rate of the nugget zone (NZ) is in between the two base metals.

This thesis is aimed to investigate microstructure, corrosion and mechanical properties of dissimilar metal weld joints between AA1000 and AA6061-T6 under different tool rotational speeds of 910, 1500, and 2280 rpm with the constant transverse speed of 30 mm/min. Several experimental works have been conducted including microstructure observation using optical microscopy and Scanning Electron Microscopy (SEM) equipped with Electron Dispersive x-ray Spectroscopy (EDS), microhardness measurements, tensile tests, and corrosion measurement using Potentiodynamic Polarization method. Results show that increasing tool rotational speed from 910 rpm to 1500 rpm increases the degree of homogeneity in nugget zone and strength of the weld joint but further increase in the tool rotational speed up to 2280 rpm degrade the mechanical properties due to coarsening the microstructure. Furthermore, corrosion rate of the nugget zone (NZ) is in between the two base metals.

Kata Kunci : Chhorn1234