Actually it's not the heat that does it, it's a mechanical thing. The sand particles are like millions of little hammers denting the surface of the metal.
On a large scale, the stretching or compressing of the skin of just one side of a piece of thin metal is going to end up in distortion.
Just like wood curling up when you get one side wet because only one side expends.
Soda blasting is much less intense on the metal surface, and much much better on sheet metal. Although, it's not nearly as aggressive as "sand", it'll strip paint, but not as good on heavy rust.
It just uses a special form of baking soda, so clean up isn't as bad - plus you can go right over chrome, glass, etc without masking. Most sand blasters can be converted pretty easily.
While I'm going on about sand blasting - be sure never to use silica sand - very, very bad for your lungs. Stick to the stuff made for sandblasting.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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