Production method of spark plug designed to provide high temperature oxidation resistance and weld strength and spark plug produced thereby
US6794804B2 · kind B2 · utility
3Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Dec 24, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug and a production method thereof is provided which is designed to improve the high temperature oxidation resistance of a ground electrode without sacrificing the mechanical strength of a weld of the ground electrode with a metal shell. The ground electrode is made of a Ni-based alloy containing 10% or more by weight of Cr and 1.5% or more by weight of Al and joined to the metal shell by resistance welding in a substantially oxygen free atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.