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What is the best plasma torch coolant?

Every plasma cutting system uses some sort of fluid to cool the torch, and prevent the electrode and nozzle from melting due to the high temperature of the plasma arc. On smaller torches, typically anything up to 100 Amps, that fluid can be air, and it can be the same air that is used as the plasma gas. But as the current gets higher, a separate cooling liquid is required to carry away all of the heat.

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