The smelting furnace in "War Dynasty" is a very important special production facility in the game. If you want to build a smelting furnace, you can first build a standard layout workshop. In addition, the smelting furnace requires 1 wood of any type and 10 Unit of clay.
How to make a smelting furnace in the Warring Dynasty
Construct a smelting furnace in a village building. If you've built a standard layout workshop, there's a perfect spot for a smelter between the workbench and general storage. Of course, the location of the first smelter is up to you, as long as it's indoors.
A smelting furnace requires 1 wood of any type and 10 units of clay. Wood is relatively easy to find - just chop down any tree, or dig up the stump with a shovel. For clay, you'll need to craft a copper pickaxe and travel to a nearby river to mine it.