I'm not Tod, but here's the plans for the gas forge that I use are at:

www.spaco.org/bk.htm

Just go to the bottom of the page and click the two links. This propane
forge design has been around for at least 25 years and it works well.
It's not my design, but everyone who has ever built one has been happy
with it. And yes, you can forge weld in it.

Pete Stanaitis
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What kind of forge do you use?