SIFAT MEKANIK DAN STRUKTUR MIKRO ALUMINIUM AA1100 HASIL PENGELASAN FRICTION STIR WELDING DENGAN VARIASI FEED RATE
Abstrak: Aluminum and aluminum
alloys have properties that are less well when compared to steel, such as
specific heat and has a high conductivity. They are also easily oxidized and
form an aluminum oxide Al2O3 which have a high melting point. Consequently,
when they are welded the fusion between base and weld metal will be blocked.
Moreover, if the cooling process is too fast it will form a smooth cavity
ex-pouch of hydrogen. FSW (Friction Stir Welding) is one solution that can be
used as an alternative to aluminum welding process. FSW is the working
principle of utilizing the friction of the rotating workpiece with a stationary
workpiece another so that the resulting heat and the heat can melt the
workpiece is stationary and connected to one end. FSW welding process tooccur
at the solvus temperature, so there is no reduction in strength due to aging
and dissolution of the precipitate over coherent. Theresearch aim is to find
the best mechanical properties, i.e strength and thoughness by varying feed
rate. Observations onto microstructures of welding area were also carried out
in this research. Feed rate was varied at 7,3, 13, 24mm/mnt. Whereas,tool
rotation used was keep constantly at 1200rpm. The material to be welded is a
4.0 mm thick aluminum AA1100 strips. Result showed that the highest strength
obtained is 61,53 MPa at 24mm/mnt and the lowest strength obtained is 49,44 MPa
at 7,3 mm/mnt.Wormholes and the lack of penetration defects are the main things
that reduce the tensile strength. From micro observations known on the grainsshape
of the stir zone, FeAl3 particles is spread more evenly in matrix of Al due to
the stir process during the welding process. Hardness tests showed that the
weld metal is softer than the base metal.
Penulis: Moh. Indra P, Mahros
Darsin, Sumarji
Kode Jurnal: jptlisetrodd110156
