Method for manufacturing an assembly of a center pin (20) and a middle electrode carrier (13) or a middle electrode (6), respectively, for a spark plug (1), which spark plug (1) can be used for igniting a combustible air-fuel-mixture in an internal combustion engine, wherein a piece (19) of wire or rod is provided having, preferably over its length, a core (21) of a first material which is surrounded by an outer layer (22) of a second material, the second material being different from the first material, wherein the core is exposed at one end of the piece of wire or rod a middle electrode carrier (13) or a middle electrode (6), respectively, is provided at said one end of the piece (19) of wire or rod a high energy beam, preferably a laser beam, is directed to the exposed core (21) and a powder is melted onto the exposed core (21) by the high energy beam such that in a contact region (18) of the powder and the exposed core (21) a microstructure composed of material of the core (21) and powder is formed after resolidification of the material of the core (21) and the powder and the core (21) is covered by resolidified powder (25) at the one end of the piece of wire or rod.