Patent Number: 6,794,804

Title: Production method of spark plug designed to provide high temperature oxidation resistance and weld strength and spark plug produced thereby

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.

Inventors: Kanao; Keiji (Kariya, JP), Hori; Tsunenobu (Kariya, JP)

Assignee: Denso Corporation

International Classification: H01T 21/02 (20060101); H01T 13/39 (20060101); H01T 13/20 (20060101); H01T 13/32 (20060101); H01T 21/00 (20060101); H01T 001/24 (); H01T 021/02 ()

Expiration Date: 09/21/2021