Structure of spark plug designed to provide higher...

Details Structure of spark plug designed to provide higher... Structure of spark plug designed to provide higher...

2005-05-10

2005-05-10

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S118000

Reexamination Certificate

active

06891318

ABSTRACT:
An improved structure of a spark plug which provides higher durability of a joint of a noble metal chip to an electrode such as a center or a ground electrode. The joint is formed by laser welding. A fused portion made of materials of the noble metal chip and the electrode fused together by the laser welding is formed in the joint so that it may continue over at least half a circumference of a contact between the noble metal chip and the electrode without interfaces of welds, thereby enhancing the activity of the fused portion as a thermal stress absorber. A welding method is also provided.

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