You seem to have terribly misunderstood Fozz. It makes perfect sense the crafters are wearing helmets. Metallurgy , Weapon making and others are still under heavy devellopment, which means some bugs might cause a Gold Stock to fly through the Smithy if Hammered wrongly, thus causing massive Trama's to the heads,even those of Kran. Also, the lack in STR training of some smith causes them to, on a very frequent base, let the hammer slip while taking a swing. The Hammer then might bounce on the anvil, on a wall and hit you on the back of your head via the beams that support the Smithies roof. Then there's the awful noise of 12 Smiths hammering away in one smithie! Imagine That! The Crafters Guilds, however, found a solution by placing substantial amounts of cotton in their helmets. This also prevents the commonly burned beards as well as loss of eyebrows and lashes.
So... As you can see, wearing helmets in a smithie, is just a safety protocol. I highly advice all Crafters to keep wearing their helmets during the dangerous and often misunderstood art of Crafting.
(http://ugo.sinet.it/survivors/uploads/Main/helmets.jpg)