if you don't have a source of known alloy pieces If you happen to have a high-school or community college nearby with a welding program, it would probably be p

if you don't have a source of known alloy pieces If you happen to have a high-school or community college nearby with a welding program, it would probably be productive to ask one of the instructors there where they source their practice material. When I was in high-school I think most of ours came from Horton Iron & Metal[1], the local scrap metal recycling firm. Probably many areas have something similar? [1]: https://www.hortoniron.com/ https://www.hortoniron.com/