It's used in welding too sometimes, though argon and CO2 are used more. I think helium is recommended for TIG welding copper if you don't have a really high-po

It's used in welding too sometimes, though argon and CO2 are used more. I think helium is recommended for TIG welding copper if you don't have a really high-powered rig since it allows for better heat transfer, but I've managed it with argon.