#11 Gating Technology - Slag Prevention (3/3)

Описание: Understand the difference between pressurized and un-pressurized gating systems plays a significant role in the quality of the casting. Not all metals react the same when they are liquid and molten under high temperatures. Therefore we need to know the "characteristics" of our metals and alloys to make the right design decisions and precautions. Re-oxidation, Slag inclusions can be reduced or even avoided if the correct gating system is applied! In this tutorial (3/3) we visualize the filling of a mold by pressurized and unpressurized gating system to show the differences.

Importance also should be given to the casting temperature! It should be always be +/- 60-80 above the liquidus. A hot metal has less flow losses and fills the mold faster and smoother than a cold melt. Fast and smooth filling always means also less slag or oxidization! Another advantage is that the risers work better when the metal is very hot instead to cold!

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