A method of applying a pen on a main electrode body, method for manufacturing a spark plug and a spark plug

A method for applying a pin (17) of a spark erosion resistant material to an electrode basic body (16), wherein the pin (17) in a first step on the electrode basic body (16) welded and in a second step by applying to the electrode basic body (16) directed deformation force is plastically deformed, characterized in that the pin (17) is placed with one of its two end faces (171) on the electrode base body (16) and welded thereto and that the subsequent deformation force on the other end surface (172) of the pin ( 17) is applied so that (by axial compression of the pin 17) is increased the diameter of the pin (17).