[eric2011 (OP)]

Hi guys.

If you make synthetic corundum crystals with an electric arc welder and make synthetic rubies as shown in the image below, what will be its uses in industrial? who or what kind of people will buy them? I mean what industries  will want them?

[eric2011 (OP)]

This is the image

[Bored chemist]

Why do you suppose that any industry would want them?
They are just "to show it can be done".

Commercial synthetic rubies look like red glass.
Synthetic sapphires look like glass.

The ones I saw were used as high pressure non-return valves.
https://www.industrialjewels.com/ball-valve-and-seat-for-hplc/

[evan_au]

Corundum is pretty hard (9 on Moh's hardness scale), so it is useful as an abrasive.

But you ideally want crystals with sharp edges, not smooth, rounded droplets.