Electric lamp or space discharge component or device manufacturi – Process – Spark plug or spark gap making
Patent
1995-05-15
1996-09-24
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
Spark plug or spark gap making
288232, 219 7813, H01T 2102
Patent
active
055585752
ABSTRACT:
Generally, the invention include a spark plug with a platinum tip partially embedded in one of the spark plug's electrodes. A spark plug according to the present invention may be prepared by first heating the area of the electrode where the platinum tip is to be attached to a temperature such that the platinum tip may be pushed into and embedded in the electrode. Thereafter the platinum tip is welded to the electrode. Heating the electrode allows the platinum tip to penetrate deeper into the electrode material. This deeper penetration or embedment will reduce the operating temperature at the weld interface (junction) which will in turn reduce the thermal stress and hence prevent cracking of the platinum tip. This deeper penetration or embedment will also reduce the rate of oxidation at the platinum tip near the weld junction and hence prevent cracking of the platinum tip.
REFERENCES:
patent: 4684352 (1987-08-01), Clark et al.
patent: 4810220 (1989-03-01), Moore
patent: 4881913 (1989-11-01), Mann
patent: 5179313 (1993-01-01), Eves et al.
patent: 5456624 (1995-10-01), Moore et al.
Chiu Randolph K.
Harris Mark J.
Brooks Cary W.
General Motors Corporation
Ramsey Kenneth J.
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