Spark plug and a method of making of same

Details Spark plug and a method of making of same Spark plug and a method of making of same

1995-02-21

1995-12-26

Bradley, P. Austin

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

21912164, H01T 2102

Patent

active

054782651

ABSTRACT:
In a spark plug including a cylindrical metallic shell having an insulator in which a center electrode is placed, a front end of which somewhat extends beyond the insulator, a noble metal portion is bonded to an outer side wall of the front end of the center electrode by means of laser beams so as to form a spark gap between the noble metal portion and a ground electrode which is depended from the metallic shell. The noble metal portion has a molten alloy layer in which the center electrode is melted into the noble metal portion, and a diffused alloy layer in which the noble metal portion is diffused into the center electrode.

REFERENCES:
patent: 4963112 (1990-10-01), Benedikt et al.
patent: 5273474 (1993-12-01), Oshima et al.
patent: 5320569 (1994-06-01), Oshima et al.

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