BUG-O Systems Flame Cutting - Manual (Page 21)

21
a. With acetylene, natural of propane gas the
tip end should be placed about 1 to 3 times
the length of the blue flame cones away from
the plate surface (about 1/8 or 3/8'' [3 or 10
mm] high). For MAPP gas the tip should be
maintained from ¼ to 3/4'' (6 to 19mm) from
the plate.
b. The torch should be square with the plate.
Do not tilt torch.
c. The top of the plate should be preheated for
a distance of 1-1/2'' to 2'' (38 to 50mm) by
moving the torch slowly back and forth over
the area.
d. Bring torch to edge of plate so ½ of the preheat
flame is touching the plate.
e. Hold at this position until a molten puddle starts
to form (a little extra preheat oxygen
sometimes is necessary to start this action
and should be reduced after the cut is started).
f. Open cutting oxygen valve and start to cut.
g. Throw the travel machine switch to start travel
along plate and immediately open the cutting
oxygen valve to start cut.
Flame Cutting Handbook.p65 5/9/2007, 8:06 AM 21