An oxy-acetylene welding kit can do all the following,fusion weld,braze weld,silver solder,heat metal to allow it to be bent and formed,heat metal to allow it to be hardened or softene,cut metal.
Fusion welded in this way steel intercooler plumbing.
An oxy-acetylene kit allows you to do nearly everything required when welding, brazing, softening/hardening or cutting of metals is needed.