How large of a forge will the burner heat up to forge welding temperatures?
This a somewhat difficult question to answer without seeing the particular forge you plan to build. If we assume a Inswool lined forge, topcoated with Satanite, and maybe some itc-100, a good estimate would be 350 cubic inches per burner. Thus, if your forge has a toal volume of 700 cubic inches, you would want to go with two Venturi burners. If you’re just building a forge for forging in and heat treating (austenitizing) in, you can go with a larger volume.
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