Electric heating – Metal heating – By arc
Reexamination Certificate
2006-01-17
2006-01-17
Paschall, Mark (Department: 3742)
Electric heating
Metal heating
By arc
C219S121490, C219S121520, C219S121500, C219S075000, C219S121590, C313S231310
Reexamination Certificate
active
06987238
ABSTRACT:
A plasma arc torch and method for improving the life of the consumable parts of the plasma arc torch, including the electrode, the tip and the shield cap. The method includes turbulating gas as it flows over the exposed surfaces of the electrode, tip and shield cap to increase turbulence in the hydrodynamic boundary layer of the gas flow, thereby enhancing convective heat transfer. The result of enhanced cooling is improved consumable parts life. For example, to increase the turbulence of the gas flow over the outer surface of the electrode, the plasma arc torch electrode has a roughened, or textured outer surface formed with dimples, axially extending grooves or spiraling grooves formed in the outer surface of the electrode. The inner and outer surfaces of the tip and the inner surface of the shield cap are similarly textured.
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International Search Report dated Oct. 25, 2001 in PCT/US 01/10511.
Horner-Richardson Kevin D.
Roberts Jesse A.
Small David A.
Paschall Mark
Thermal Dynamics Corporation
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