Patent ID: 9368943
Filing Date: 2016-06-14
CPC Classification: H01T

Claim Text:
1. A spark plug, comprising: a metal shell having an axial bore; an insulator at least partially disposed in the metal shell axial bore and having an axial bore; a center electrode at least partially disposed in the insulator axial bore; a ground electrode attached to the metal shell and having a spark-gap facing surface and a distal end surface; and a multi-layer sparking component attached to the spark-gap facing surface of the ground electrode with a resistance welded weldment and having a precious metal layer that is precious metal based and a base metal layer that is non-precious metal based, wherein a greatest thickness dimension of the precious metal layer ranges between approximately 0.05 mm and 0.25 mm, inclusive, the multi-layer sparking component includes an intermetallic layer formed between the precious metal layer and the base metal layer before the multi-layer sparking component is resistance welded to the spark-gap facing surface of the ground electrode, and a portion of the multi-layer sparking component overhangs the distal end surface of the ground electrode.