Copper electrode because is the alloy material, so its melting point is lower than the pure copper melting point, in the welding of copper, copper electrode will first melt, but will not burn the welding copper.If you use copper wire to replace the copper electrode, the operation technology is high can, poor operation technology will be because the copper wire and the temperature of the welding copper, if not good grasp, it will burn the welding copper pieces.