wrought iron

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An easily welded and forged iron that is a mechanical mixture of refined metallic iron with 1 to 3 percent siliceous slag.

from The Century Dictionary.

• noun Iron that is or may be wrought into form by forging or rolling, and that is capable of being welded; malleable iron. See iron.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A tough, malleable, ductile form of iron that is not cast, suitable for welding.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun iron having a low carbon content that is tough and malleable and so can be forged and welded