You're already risking your life by making a homemade welding power supply, no need to bother putting on gloves.
... when he was 15...
Not only that, the engineering prodigy from Sierra Leone once built a battery out of scrap metal, baking soda and acid to power his family's house. Yep, he is a kludge god in the purest sense of the term. Uproxx called him a teenage Tony Stark, and we'd be inclined to agree. I'd also like to add this request:
Get. This. Kid. A. Scholarship. MIT, Cal-Tech, Harvey Mudd, Olin, anywhere. Step up!