ANALISIS KEKERASAN, CACAT LAS, DAN STRUKTUR MIKRO PADA SAMBUNGAN T PADUAN ALUMINIUM 6061 T6511 HASIL GAS METAL ARC WELDING (GMAW) DENGAN VARIASI KUAT ARUS
Abstract: AA 6061 T6511 is an
aluminum alloy with composition Al 96,61 Wt %, Cr 0,04 Wt %, Cu 0,15 Wt %, Fe
0,7 Wt %, Mg 1,15 Wt %, Mn 0,15 Wt %, Si 0,8 Wt %, Ti 0,15 Wt %, and Zn 0,25 Wt
%. Gas Metal Arc Welding (GMAW) is a welding process that the energy obtained
from an electric arc. Arc welding to occur between the surface of the workpiece
with the electrode wire coming out of the nozzle together with the protective
gas. GMAW AA 6061 T6511 using filler metal ER 5356 with composition of 0,2% Mn,
0,25% Si, 0,4% Fe, 5,5% Mg, 0,2% Cr, 0,1% Cu, 0,2% Ti, 0,1% Zn, and 0,0003% Be.
From a visual test known GMAW process with strong currents 120 amperes
generates heat input of 0,504 kJ/mm, GMAW process with strong currents of 150
amperes generates heat input of 0,837 kJ/mm, and the GMAW process with strong
currents of 180 amperes generates heat input of 1,168 kJ/mm. From inspection of
defects on the surface was found that the results of GMAW are undersize weld,
excessive convexity, excessive undercut, overlap, and incomplete fusion. From
inspection of surface defects in GMAW welding of AA 6061 T6511 are spherical
porosity and wormholes porosity. The area has the highest hardness in the heat
affected zone is located at GMAW AA 6061 T6511 180 amperes is equal to 51,33 BHN,
the lowest hardness of 24 BHN which is located on the base metal area on GMAW
AA 6061 T6511 120 amperes, and microstructure observations show an increase in
diameter the highest point on the AA 6061 T6511 from 61 μm after GMAW process
180 amperes becomes 21 μm.
Penulis: Ahmad Jukliv Pandu
Yoedhawan, Sumarji
Kode Jurnal: jptmesindd140517
