Ignition device having an induction welded and laser weld reinforced firing tip and method of construction
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United States of America Patent
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Sep 27, 2011
Issued Date -
N/A
app pub date -
Sep 26, 2007
filing date -
Jan 18, 2007
priority date (Note) -
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Abstract
An ignition device for an internal combustion engine and method of construction therefore includes a housing with an insulator secured therein. A center electrode is mounted within the insulator. A ground electrode extends from the housing with a portion of the ground electrode defining a spark gap across from the center electrode. The center electrode has a firing tip, wherein a resistance weld joint initially bonds the firing tip to the center electrode and a continuous bead of overlapping first weld pools formed substantially from the material of the firing tip further bonds the firing tip to the electrode. A continuous bead of overlapping second weld pools formed radially outwardly from the first weld pools forms a rounded shoulder surface extending from the first weld pools to an outer surface of the center electrode.
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