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Different fuels absolutely burn at different temps.
I'm a welder and a blacksmith.
When you're using coal, you use an easily ignitable fuel, like wood or naptha to get the coal to burn.
The coal burns hotter and is harder i start than your starter fuel, and cannot be started with just a spark.
The coal burns down into coke, a totally different substance, which burns hotter than the coal.
Even still, on your third level of fuel, in order to actually get steel to a workable temp, you've got to add more oxygen, to make it burn even faster and hotter.
This is all inside a forge, a device that's well insulated and made to heat steel to a workable temp.
There are other fuels that can be made to work, and they all also require blower fans, to add more oxygen.
Or in the case of an oxy/acetelne cutting torch, a bottle of pure o2
Charcoal, derived from wood in a similar fashion to coke from coal, can sort of be used, but does not and will not burn hot enough for anything much larger than a spoon, and aimply can't get hot enough for forge welding.
Now, essentially a giant housefire, getting hot enough to get those steel beams to fail? Sure!
Why'd they collapse from the bottom, that wasn't on fire?
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?