| 摘要 |
An electrode for a plasma arc cutting torch, wherein the electrode comprises a holder having a tapered tip and emissive element concentrically disposed therein. The holder has an included angle of taper at the tip of between about 25° and about 40° and a diameter at the tip approximately equal to, or slightly larger than, the diameter of the end surface of the emissive element. The electrode is configured such that the holder comprises a relatively thin holder wall at the tip of the electrode which evaporates due to the heat from the adjacent arc generated through the emissive element such that the tapered tip erodes generally simultaneously with the emissive element. Generally simultaneous erosion of both the holder and the emissive element thus avoids the problems of overheating and/or double arcing and extends the service life of the electrode. A method of operation of a plasma arc torch is also provided.
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