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BINGO...we have a winner in the "How Come those Buidings Fell" category.
I was also a welder. Then became a commercial concrete worker.
Now I'm a building inpsector..oh wait...a "damn" building inspector..have to keep those titles straight..
I inspect, among other things, the spray-applied fireproofing for commercial buildings..it's a nasty looking, gray colored, cementitious, (sea-men-ti-shus) material, which looks like elephant snot with hair..
but it will protect the structural steel framing of a building for 3 hours, at 2200 degrees Farenheit...I doubt it will protect a building from a commercial airliner loaded with fuel, though.
What amazed me at the time, was that Congress had to convene a special hearing to find out what I, or backhoe, or any construction worker who has built them, could have explained in 5 minutes, without visual aids.