Here's the text of a patent describing the process. [0] Googling "fullerene" will get you more useful hits than C-60, so, e.g. "generating fullerene from arc welding."

[0] https://patents.google.com/patent/US5227038A/en

Bing found two URLs... Both to this page. Google found one -- also here -- and two ads.

This:

   generate fullerene "arc weld"

Worked a bit better in both. N.B: Quote marks only around the "arc weld" bit.

I believe the original paper on Buckminsterfullerine aka Bucky balls aka C60 described the approach. Basically do violent stuff with carbon and stick it in a mass spectrometer. The violent carbon bit is arc welding, because the arc welding tips are made of graphite.

Wikipedia informs me that the first papers used a laser (https://www.nature.com/articles/318162a0 - "graphite has been vaporized by laser irradiation, producing a remarkably stable cluster consisting of 60 carbon atoms") (1985) and the arc welding approach was a few year later. The paper "Solid C60: a new form of carbon" (1990) paper describes using benzene to dissolve the soot to extract the C60 (https://heyokatc.com/pdfs/MISC/Solid_C60-_a_new_form_of_carb...).