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In some aspects, nozzles for a gas-cooled plasma torches can include a hollow generally cylindrical body having a first end and a second end that define a longitudinal axis, the second end of the body defining a nozzle exit orifice; a gas channel formed in the first end between an interior wall and

In some aspects, nozzles for a gas-cooled plasma torches can include a hollow generally cylindrical body having a first end and a second end that define a longitudinal axis, the second end of the body defining a nozzle exit orifice; a gas channel formed in the first end between an interior wall and an exterior wall of the cylindrical body, the gas channel directing a gas flow circumferentially about at least a portion of the body; an inlet passage formed substantially through a radial surface of the exterior wall and fluidly connected to the gas channel; and an outlet passage at least substantially aligned with the longitudinal axis and fluidly connected to the gas channel.

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1. A nozzle for a gas-cooled plasma arc torch, the nozzle comprising: a hollow generally cylindrical body having a first end and a second end that define a longitudinal axis, the second end of the body defining a nozzle exit orifice;a gas channel formed in the first end between an interior wall and

1. A nozzle for a gas-cooled plasma arc torch, the nozzle comprising: a hollow generally cylindrical body having a first end and a second end that define a longitudinal axis, the second end of the body defining a nozzle exit orifice;a gas channel formed in the first end between an interior wall and an exterior wall of the cylindrical body, the gas channel directing a gas flow circumferentially about at least a portion of the body;an inlet passage formed substantially through a radial surface of the exterior wall and fluidly connected to the gas channel, the inlet passage defining an inlet port formed through the radial surface of the exterior wall; andan outlet passage at least substantially aligned with the longitudinal axis and fluidly connected to the gas channel, the outlet passage defining an outlet port formed through a second exterior radial surface of the body between the second end of the nozzle and the inlet port. 2. The nozzle of claim 1, the nozzle further comprising a plurality of inlet passages. 3. The nozzle of claim 2 wherein a radial angle between respective inlet passages is about 120 degrees. 4. The nozzle of claim 1, the nozzle further comprising a plurality of outlet passages. 5. The nozzle of claim 4 wherein a radial angle between respective outlet passages is about 120 degrees. 6. The nozzle of claim 1, the nozzle further comprising a plurality of inlet passages and a plurality of outlet passages. 7. The nozzle of claim 6 wherein the inlet passages are radially offset from the outlet passages. 8. The nozzle of claim 1 wherein the circumferential gas flow along the gas channel extends about an entire circumference of the nozzle. 9. The nozzle of claim 1 wherein a portion of the nozzle walls are configured to mate with an exterior surface of a swirl ring. 10. The nozzle of claim 9 wherein the swirl ring forms a portion of the gas channel. 11. A nozzle for a gas-cooled plasma arc torch, the nozzle comprising: a hollow generally cylindrical body having a first end and a second end that define a longitudinal axis, the second end of the body defining a nozzle exit orifice;a plenum region defined within the body and directing a plasma gas;a cooling gas channel formed in the first end between an interior wall and an exterior wall of the cylindrical body, the cooling gas channel isolating a cooling gas from the plasma gas;a substantially radially oriented inlet passage fluidly connected to the gas channel, the radially oriented inlet passage defining an inlet port formed through a radial surface of the body; anda substantially longitudinally oriented outlet passage fluidly connected to the gas channel, the substantially longitudinally oriented outlet passage defining an outlet port formed through a second radial surface of the body between the second end of the nozzle and the inlet port. 12. The nozzle of claim 11, the nozzle further comprising a plurality of radially oriented inlet passages. 13. The nozzle of claim 12 wherein a radial angle between respective inlet passages is about 120 degrees. 14. The nozzle of claim 11, the nozzle further comprising a plurality of outlet passages. 15. The nozzle of claim 14 wherein a radial angle between respective outlet passages is about 120 degrees. 16. The nozzle of claim 11, the nozzle further comprising a plurality of inlet passages and a plurality of outlet passages. 17. The nozzle of claim 16 wherein the inlet passages are radially offset from the outlet passages. 18. The nozzle of claim 11 wherein the circumferential gas flow along the gas channel extends about an entire circumference of the nozzle. 19. The nozzle of claim 11 wherein a portion of the nozzle walls are configured to mate with an exterior surface of a swirl ring. 20. The nozzle of claim 19 wherein the swirl ring forms a portion of the gas channel. 21. The nozzle of claim 11 wherein the plasma gas and the cooling gas combine at the exit orifice of the nozzle. 22. A method for cooling a nozzle for a plasma arc torch, the method comprising: providing the nozzle having a hollow body with a first end and a second end, the second end of the body defining a nozzle exit orifice, a gas channel formed in the first end of the body, a substantially radially oriented inlet passage fluidly connected to the gas channel, the radially oriented inlet passage defining an inlet port formed through a radial surface of the body, and a substantially longitudinally oriented outlet passage fluidly connected to the gas channel, the substantially longitudinally orientedoutlet passage defining an outlet port formed through a second radial surface of the body between the second end of the nozzle and the inlet port;flowing the cooling gas through the inlet passage into the gas channel;directing the cooling gas along the gas channel; anddischarging the cooling gas from the gas channel to the outlet passage.