The drawing below shows a forge made from two flowerpots. Does this seem like a good idea? The reason I wish to make a flowerpot forge is that flowerpots are readily available in many different sizes. Also, is it a good idea to insulate the forge with LECA and fireclay? I've got this idea about not wasting too much heat into the surroundings. Would insulation lower the fuel consumption and also make it easier to obtain welding temperatures?

Is this going to be a solid fuel, ie: coal, or gas fired.
If it is for coal, how do you plan to tend the fire?

Good point about tending the fire as it is supposed to be coal fired. I guess that would call for an opening so large that I could just as well do away with the flowerpot #1?

Having melted a flowerpot in my coal forge I would say that some sort of refractory insulation would be required. Flowpots are usually a very low temperature clay like terra cotta.