Welding Merit Badge
http://www.scouting.org/scoutsource/boyscouts/advancementandawards/merit...
Metal Working Merit Badge
http://www.scouting.org/Home/BoyScouts/AdvancementandAwards/MeritBadges/...
the Blacksmithing Merit Badge was discontinued in 1952
Requirements at discontinuation
Make an open link of 3/4-inch stock.
Forge a chain hook out of 3/4 x 1/2-inch soft steel or 3/4-inch round iron.
Make a bolt of 1/2-inch iron.
Bend and weld three links and form them into a chain, these links to be fastened to the hook of Requirement 2 by a ring, and links and ring to be made out of 3/8-inch iron.
Make a straight lap weld of 1/4 x 1-inch stock.
Make a rock drill.
Temper a rock drill.
Explain how to harden and temper a cold chisel.
Check out this blacksmithing