Electrode wire for wire electrodischarge machining, method of manufacturing the same, and system for manufacutring base wire for the same

A electrode wire for wire electrodischarge machining, the electrode wire including a core made of copper or copper alloy, a pure zinc layer formed by hot-dip galvanizing the core, and a copper-zinc alloy layer formed by mutual thermal diffusion thermal across the interface between said pure zinc layer and said core;

• wherein said thermal diffusion layer includes an inner copper-zinc alloy layer formed by thermal diffusion of the zinc through the core surface and into the core material, and an outer copper-zinc alloy layer formed by thermal diffusion of the copper of the core material into the molten pure zinc;
• wherein said pure zinc layer is thicker than said thermal diffusion layer and the thickness of said pure zinc layer constitutes at least 1.2% of the diameter of said electrode wire for wire electrodischarge machining, and there is no cracking on the surface of the electrode wire.

A system for manufacturing a base wire for an electrode wire for wire electrodischarge machining by forming a pure zinc layer by hot-dip galvanizing a preheated core made of copper or copper alloy, the system comprising:

• a jet blower being disposed with a jet tip facing the bath surface through which the core emerges from the hot-dip galvanizing bath to blow a non-oxidizing gas through the jet tip to remove a layer of impurities including oxide films and products of reaction with flux and to keep exposed the pure zinc bath surface.