| 摘要 |
Iridium-tipped electrodes (such as spark plug electrodes) are made by providing an ignition device electrode having a free end; abutting the free end of the electrode to a first end of an axially symmetrical iridium or iridium alloy tip aligned with the longitudinal axis; friction welding the tip to the free end of the electrode; and machining away material from the free end so as to produce a tapered portion of the free end, which tapered portion tapers outwardly with spacing from the free end of the electrode. |
