Production method of spark plug designed to provide high temperature oxidation resistance and weld strength and spark plug produced thereby
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United States of America Patent
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Sep 21, 2004
Grant Date -
Apr 3, 2003
app pub date -
Aug 22, 2002
filing date -
Aug 22, 2001
priority date (Note) -
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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.
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