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This study  investigates AA6061-O  and SUS304  dissimilar  welding with  preheating  of stainless  steel SUS304 prior to  welding  process.  The  welding  method used  was  metal  inert gas  (MIG)  with  butt  joint  type  weld.  The  mechanical  strength  was  investigated  using  tensile \udtest. Meanwhile, the macrostructure  and  microstructure  of the specimens were analyzed using optical  microscope,  scanning  electron  microscopy  (SEM)  and  energy  dispersive  spectroscopy (EDS).  The  tensile  tests  indicate  that  the  preheated  specimen  with  90 °C  have  the  maximum ultimate  tensile strength  of 111 MPa. In addition to that, the intermetallic  compound (IMC) of \udthe all  the  specimen  was  observed to  be in the  range  of 1.59 μm to 10.8 μm.  Fracture failures occur at the  IMC interfaces on  all specimen,  where a thicker  IMC  layer consequently  yields  a lower  tensile  value.  It  can  be  concluded  that  the  optimum  parameters  for  AA6061-O  to \udSUS304  welding  can  be  achieved  at  90 °C  with  17.5 V  welding  voltage  and  110 A  welding current

Investigation of preheating method on joint strength of aluminium-stainless steel dissimilar welding using metal inert gas (MIG) process