Patent ID: 9197038
Filing Date: 2015-11-24
Classification: B23K,H01T

Abstract:
1. A spark plug comprising: a center electrode, a ground electrode body, and an electrode tip that is resistance welded to the ground electrode body and that has a discharge surface that forms a gap between the discharge surface and the center electrode, wherein, in a specific sectional plane, which is one of sectional planes that perpendicularly cut the discharge surface and which cuts the discharge surface so that a linear length of the discharge surface is largest, when a first direction is defined as a direction that is perpendicular to the discharge surface and in which the ground electrode body is located as viewed from the discharge surface and a point P the welding surface is located in the first direction from an outer surface of the ground electrode body, and the welding surface includes a flat portion whose distance to the point P when a point E in the second direction from the point E a linear length L