Electric lamp or space discharge component or device manufacturi – Process – Spark plug or spark gap making
Reexamination Certificate
2004-11-18
2010-02-23
Santiago, Mariceli (Department: 2879)
Electric lamp or space discharge component or device manufacturi
Process
Spark plug or spark gap making
C313S141000, C313S143000, C313S145000
Reexamination Certificate
active
07666047
ABSTRACT:
There is provided a method for producing a spark plug in which welding strength between a noble metal tip and an electrode joined by laser welding can be restrained from becoming weak.A noble metal tip (90) to be joined to a center electrode (2) or ground electrode of a spark plug to form a spark discharge gap is resistance-welded to each electrode containing no noble metal and then laser-welded. In the noble metal tip (90) exposed under a severe environment involving spark discharge, a molten portion (80) formed in such a manner that a portion of the noble metal tip (90) and a portion of the electrode are melted by laser welding and a non-molten portion (95) on the noble metal tip (90) side are apt to be peeled from each other in a boundary surface (83) between the molten portion (80) and the non-molten portion (95). The noble metal content in the molten portion (80) however becomes higher because a flange portion is formed in a bottom portion by pressing force applied on the noble metal tip (90) at the time of resistance welding and then irradiated with a laser beam. Accordingly, peeling can be prevented from occurring in the boundary surface (83).
REFERENCES:
patent: 4540910 (1985-09-01), Kondo et al.
patent: 4700103 (1987-10-01), Yamaguchi et al.
patent: 5461210 (1995-10-01), Matsutani et al.
patent: 5461276 (1995-10-01), Matsutani et al.
patent: 5465022 (1995-11-01), Katoh et al.
patent: 5558575 (1996-09-01), Chiu et al.
patent: 5811915 (1998-09-01), Abe et al.
patent: 6215235 (2001-04-01), Osamura
patent: 6533628 (2003-03-01), Matsutani
patent: 2001/0005109 (2001-06-01), Matsutani
patent: 2002/0017846 (2002-02-01), Hori
patent: 2002/0105254 (2002-08-01), Hori et al.
patent: 2002/0121849 (2002-09-01), Kanao et al.
patent: 3-176979 (1991-07-01), None
patent: 03176979 (1991-07-01), None
patent: 05036462 (1993-02-01), None
patent: 5-234662 (1993-09-01), None
patent: 7-22155 (1995-01-01), None
patent: 9-106880 (1997-04-01), None
patent: 11-233233 (1999-08-01), None
patent: 2001-15245 (2001-01-01), None
patent: 2001-60488 (2001-03-01), None
patent: 2001-244042 (2001-09-01), None
patent: 2002-50448 (2002-02-01), None
patent: 2002-313524 (2002-10-01), None
Kato Tomoaki
Suzuki Akira
Taido Akikazu
Torii Kazuyoshi
NGK Spark Plug Co. Ltd.
Santiago Mariceli
Sughrue & Mion, PLLC
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