Patent ID: 9231379
Filing Date: 2016-01-05
CPC Classification: H01T

Claim Text:
1. A spark plug, comprising: a shell having an axial bore; an insulator having an axial bore and being disposed at least partially within the axial bore of the shell; a center electrode disposed at least partially within the axial bore of the insulator; a ground electrode attached to the shell and composed of a nickel-based alloy material; and a firing pad attached to the ground electrode and composed of a platinum-based alloy material containing at least 25 wt. % of nickel, the firing pad having a protrusion projecting from a bottom side of the firing pad that concentrates current flow therethrough amid a resistance welding process, wherein the attachment between the firing pad and the ground electrode includes a resistance-welded weldment and lacks a laser-welded weldment, the protrusion facilitates the absence of a laser-welded weldment in the attachment between the firing pad and the nickel-based alloy material of the ground electrode.