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Depends entirely on the design and structure of your forge. Heat can be added in unlimited quantities, and so long as it cannot escape through any openings or through anything weakly insulating, it will simply accumulate ... and accumulate ... and accumulate, as you add more and more joules. The temp will get hotter ... and hotter ... and hotter. What your source of heat is, is irrelevant. This is how the interior of your car gets hotter than the surroundings on a sunny day, despite the source being the same, yes? Containment of the slowly-accumulating heat.
It's like weight. It doesn't matter how heavy a hippo is, if we keep adding hippo ... after hippo ... after hippo to a set of scales, we can eventually reach whatever weight, yes? Accumulation, not individual hippo weight, is what matters. Heat in a forge is no different, assuming your forge contains all the heat produced properly.
And they didn't, they collapsed starting higher up. Check an unedited video.
Ah yes, the sun, heating up my car to millions of degrees with its nigh-infinite fuel source. As it does.
Yeah, insulation matters, that's half the point of the forge. The other half is the fuel you're using. Regular wood fires cannot get hot enough to melt steel.
Oxy/acetelene torches burn hot enough they need no insulation to nearly instantly liquefy steel. Propane cannot do that. Even with the oxy.
Anyway, are you talking about the live footage I watched in school? Where they clearly collapsed from the bottom, like a controlled demolition? The day it happened?
We had a half day
Different fuels do release different amounts of heat when burned, this is true. But, the amount of heat in a fuel, and "temperature" are two different things. Did you not understand my explanation of how that worked?
Memory can get foggy after even a few years, much less 20. Brains are not as pure as we like to think. This is why witness testimony is such weak evidence in a courtroom, where physical evidence like fingerprints are considered much better. People's memories suck.
edit: So how about this one. If wood fires "burn at a low temperature", how does the inside of a forest fire get over 1000 C? If wood just burns at a set temp, wouldn't that be the temp they can reach?