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Metal casting is one of the manufacturing techniques where metal is melted in a smelting
furnace and then poured into a mold cavity similar to the original shape of the cast product made
which is then allowed to cool and solidify. In casting, it takes some planning in doing metal casting. One
of them is the casting time, this can be done using a simulation from the Altair Inspire Cast software
where this software can simulate the metal casting process. Besides being able to perform simulations,
this software can detect defects in metal casting to be carried out. The defects that exist in metal
casting include porosity, shrinkage, shift, metal penetration, gas defects, etc. One of the defects of
metal casting that often occurs is porosity. This porosity can occur due to low permeability so that the
gas is trapped in the cavity, the compressive strength of the molding sand is too high causing vortexes,
the gas generated from the mold is high, and the superheating temperature is not suitable. This test
will be carried out to determine the ratio of the percentage of porosity between the simulation results
from the software and the results of the actual castings.