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Can an electric spark be generated under vacuum?

It is certainly possible to discharge under vacuum. It has been tested and it is very dangerous.

Discharge produces an electric spark, which is also a fire. Just like lightning, it is usually called an arc.

Welding can be carried out under oxygen-free conditions. Gas shielded welding is to prevent oxygen and welding things from oxidation, and oxygen welding is needed. Just bring oxygen!

Your question is very interesting.