| 摘要 |
A threaded connection for an electrode holder and an electrode in a plas ma arc torch is provided. The threaded connection has relatively low height, an d the engaged portion of a male threaded portion of the electrode and a female threaded portion of the electrode holder are positioned at least partially within a nozzle chamber. In one inventive aspect, the nominal pitch diameter of the electrod e is less than the minor diameter of the electrode. In another, the width of the root area of the electrode thread is wider than the width of the root area of the electrode holder thread by at least about 35%. The width of the root area of the electrode is at least about 15% wider than the width of the crest portion of the electrod e. As such, the less consumable of the two parts, the electrode holder, is provide d with a thread that is less likely to be worn and damaged. In one particular embodiment, the crest profile of the electrode is that of a Stub Acme thread separated b y a larger root profile. |
