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Materials Science. I hate the class, but it explains all of this, even the liquid glass (which by asme standards has to flow a certain amount over a time period to constitute liquid vs. solid, which that glass is off by a hundred years or so..).
As much as I find some of the information boring, the professor says the basics of the class explain welding, and it shows with talk of micrograin structures, heating and cooling cycles, corrosion, and few other things. I think even an experienced welder could learn something from the class (maybe not this one specifically, but the Material Science in general).
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