Forge made from an old extinguisher

Made this propane forge from an old extinguisher i had laying around.

Used some 1350 C mortar for the ceramic wool so no danger after heating it.

For the burner used a simple and cheap weed burner that cost me about 20 euros.

It seems like it works fine but the metal is heated took more than 10-15 minutes to get red (see near end of video)

Sorry for my welding don't have any experience