Just a tidbit I picked up from the internet. Applies somewhat to the welding
discussion we had before.
"Drivers are also questioning NASCAR's decision last year to increase the
strength of the front-end roll bars from 93-hundredths to 125-hundredths
steel. The stronger front-end bars could make the car less crushable. And
there are complaints about crews being allowed to use chrome-moly alloy in
the rollbars; that makes for stronger bars, but chrome-moly doesn't bend as
easily as other steel and can actually fracture. Plus if welding isn't done
just right, the welds can crystallize, crews say."
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