Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1995-01-12
1995-10-24
O'Shea, Sandra L.
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
313142, 313143, H01T 1320
Patent
active
054612764
ABSTRACT:
In an electrode for a spark plug, an elongated blank metal is made of a nickel-based alloy and including a front surface. A firing tip is provided from a slug made of a noble metal, the slug being concentrically placed on the front surface of the elongated blank metal and laser beam welded to thermally melt the entire slug and thereby produce a thermal weld, so that the front surface of the elongated blank metal is partly fused together with the slug to form a melted portion with the front surface and the slug so as to contain the front surface within the melted portion in the range of 0.5 wt % to 80.0 wt %.
REFERENCES:
patent: 4488081 (1984-12-01), Kondo et al.
patent: 4699600 (1987-10-01), Kondo
patent: 4743793 (1988-05-01), Toya et al.
patent: 4771210 (1988-09-01), Mohle et al.
patent: 4803395 (1989-02-01), Matesco
patent: 4840594 (1989-06-01), Moore
patent: 4904216 (1990-02-01), Kagawa et al.
patent: 4963112 (1990-10-01), Benedikt et al.
Kagawa Junichi
Matsutani Wataru
NGK Spark Plug Co. Ltd.
O'Shea Sandra L.
Patel Vip
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