Process of restarting arc after power failure during vacuum consumable smelting of titanium and titanium alloys

The process of restarting arc after power failure during vacuum consumable smelting of titanium and Grade 5 Ti-6Al-4V Titanium Plate includes the following steps: when restarting arc after smelting interruption, the smelting current is rapidly increased to 75-80% of the normal smelting current, and the current is maintained at this time. When the edge of the molten pool reaches the crucible wall, keep it for 2-3 minutes, and then quickly increase the smelting current to the normal smelting current. The advantage of this process is that the total arcing time is greatly shortened, the gap between the cooling volume of the ingot and the crucible wall is reduced, and the internal shrinkage cavity formed by the cooling and solidification of the ingot is avoided: when the melting current reaches the normal melting current When the smelting current is 75~80%, keep the smelting current for a period of time, so that the melting speed of the electrode and the solidified molten pool can be controlled more accurately, so as to avoid the instantaneous generation of a large amount of molten liquid flowing into the gap between the ingot and the crucible wall, or causing cold insulation defects .