Patent ID: 7637793
Filing Date: 2009-12-29
Classification: B23K,H01T

Abstract:
1. A method for producing a spark plug having at least two electrodes, in which the electrodes each include at least a base part, made of a substrate material of the spark plug, and a surface part, made of a material more durable than the substrate material, comprising the following steps: forming a blank comprising a surface part and an intermediate part, by joining the surface part to the intermediate part by means of explosion welding, separating a part with a suitable form from the blank to form the electrode of the spark plug, wherein the part that is separated from the blank includes both a portion of the surface part and a portion of the intermediate part, and fastening the part separated from the blank to the base part of the spark plug so that a joint is made between said base part and said portion of the intermediate part.