I put a rheostat to control the blower and I experimented last night trying to forge weld i was able to get the steel to a very bright orange or yellow color. I tried folding a file its kinda sticking on the end thats it. Ill try it with borax next.
Either way i guess it should get up to temp if i throw a bunch of charcoal in, id assume it all comes down to efficency after that.