BUG-O Systems Flame Cutting - Manual (Page 23)

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(2) In sketch #2 the top edge has a roll. Too hot
a preheat flame has melted away the edge
and rounded the corners. To avoid this, the
preheat flame must be reduced by slightly
closing the preheat oxygen valve and the gas
valve. Keep repeating this procedure until
edge cut is square.
Flame Cutting Handbook.p65 5/9/2007, 8:06 AM 23