Just in case you might think the above is just "internet fact", this
Since 1963, Retech has enjoyed being a worldwide leader in the production of Vacuum Arc Remelt (VAR) furnaces designed to melt reactive and refractory metals as well as steel. Retech VAR furnaces can be configured for a range of capacities for producing ingots or castings, from a laboratory...
www.retechsystemsllc.com
is the kind of "welders" I used to work on - power supply outputs ranged from 30,000 to 50,000 amps, furnaces produced ingots (usually Titanium or Zirconium) from 26" to 40" diameter and up to 24 feet long. Inlet power was 4160 volts, fed directly from transmission lines.
We had lathes big enough to turn the surface of the largest ingots, the lathes were loaded/unloaded with a 30 TON crane, 2 cranes ran on the same rails and covered the entire area of a 80' x 200' building. There were 5 remelt furnaces and an electron beam "recycle" furnace in the building.
That was the first rare metals company I worked for (9 years) - the second one (25 years) had multiple melt areas, about 30 remelt furnaces, and started the rare metals process by chemically extracting metals from common beach sand - the process is incredibly complex, and yields Zirconium, Titanium, Hafnium, and Niobium. The various alloys of those metals allowed us to produce everything from heart valves to parts for nuclear reactors.
Best thing about those jobs is that I almost NEVER got bored

... Steve