Pengaruh Kecepatan Putar Spindle Terhadap Sifat Mekanik Dan Struktur Mikro Pada Dissimilar Metal Alumunium A1100 Dan Tembaga Dengan Proses Mikro Friction Stir Welding

Friction stir welding (FSW), is a metal welding method using the heat generated
between the tool and the workpiece to be welded. This research was conducted to
determine the spindle rotation speed on the mechanical properties and microstructure
using the microfriction stir welding (µFSW) method on different metallic materials
such as aluminum A1100 and copper with a thickness of 0.5 mm for each specimen.
This study uses a variation of the spindle speed parameters of 540 rpm, 910 rpm,
1500 rpm, and 2280 rpm. The fixed parameters used in this study are 1ᴼ tilt angle, 60
mm/min feedrate, 4 mm tool pin diameter, 18 mm shoulder diameter, and 0.8 mm
feeding depth. The procedure for testing micro and macro structures is etching using
Al-Cu etching with a composition of 5 g Fecl3, 50 ml HCl, 100 ml water and for
hardness testing using 0.1 kgf load and for tensile testing using the EN12814-2
standard.
Zone is an area that has a finer grain when compared to other areas due to the
area that is directly exposed to heat during the welding process. The results of the
hardness test obtained are that the highest hardness value is found at the 2280 rpm
parameter in the stir zone area of 123 VHN and the lowest hardness value is found at
the 540 rpm parameter in the base metal area of 20.1 VHN. The interesting test results
explain that the value of the highest tensile stress is found at 2280 rpm variation of
40,093 MPa and the lowest stress at 910 rpm variation of 17,129 MPa. Of all the
variations of the spindle rotation speed parameter used, the variation of 2280 rpm is
the most appropriate variation based on the tests carried out.