No Ingots on Anvil -----> Shields tab only available
1 ingot on anvil ------> Dagger/Small Blade (spear) is selectable (Swords) - Ingot must be hot/ready/Heated
2 ingots on anvil -----> All heads available ---> Sword/Normal blade(Swords), Hatchet(one hand axe)(axes), and Small Hammer Head (one hand hammer, polehammer) (Blunts)
3 ingots on anvil -----> all heads available (except maybe Shield, nothing to craft from it) ---> GreatHammer (Blunts), Greataxe/Waraxe/2h axe and Pickaxe (axes), and Greatsword (swords)
Note: Once you have a tab selected, it'll remain select until you change it again - So if you crafted a Blunt with 2 ingots and then threw three ingots on, You'll craft another blunt just by smacking it.