If I remember correctly, it already has...
Edit, I remember now, page 6 second paragraph.
"When welding tubular structures greater than 15' in diameter, plate preheat shall exceed 2000F if the initial roll of the plate is warped to bring it back intoalignment.
If said tube/can is dropped by the crane, and subsequent dent to large to fill with bondo, repair area shall be heated to 2000F and hammered until it looks like a tortoise shell, fill welded and bondo'd to smooth appearance"
Here is the original thread
http://www.aws.org/cgi-bin/mwf/topic_show.pl?pid=77875;hl=farm%20code#pid77875