Abstract
The electrical contact resistance behavior of the interface between the copper electrode and the graphite welding pool plays an important role in penetration brazing of Cu/Ni metal wires. Based on the fractal contact resistance model, the contact resistance between the copper electrode and the graphite welding pool is established by taking the oxide ablation of the graphite surface into account. The influences of the graphite ablation on the contact resistance for different pressure and different graphite materials are experimentally investigated. The ablation phenomenon on the surface of the graphite welding pool is observed during the welding process. It is found that the contact resistance slowly increases as the ablation degree of the graphite welding pool surface increases. The present work shows that the impact of the common graphite ablation on the interface contact resistance is more obvious than that of fine graphite.
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