segregations-influenced-by-melting-temperature Vacuum arc furnace Vacuum arc remelting=VACInfeed rate of the electrodes: - Affects the electric arc and therefore the depth of the bath. This influences the frequency of white spots.Vacuum changes: - Signs of the entrance of foreign media through air or water leakages. - Gases and vapors from fouling of the electrodes. - Leakages of the cooling gas - Degasing the consumable electrode - Dropping of larger electrode pieces, white spot formation, especially fouled types. - Cooling water encroachment: - Hydrogen (embrittlement) - Oxygen (oxide formation)Cooling gas - Influences the bath form and depth - Gas type: He, Ar, H2 - Gas pressure and leakagesElectric arc current: - Fluctuation in the current, indicates changes in the consumable electrode (cavities). - Weak arc causes flat melting baths that create more white spots of a the potentially dangerous type.Changes in the melting temperature influence the frequency of segregations.