BUG-O Systems Flame Cutting - Manual (Page 27)

27
4. The torch was too far from the work in this cut.
It produced excessive melting at the top edge
of the cut. A thin layer of scale will stick
approximately 1/3 to 1/2 the depth of the cut.
Slag will also stick to the bottom edge of the cut.
The scale and slag must be vibrated or chipped
to make the surface suitable for welding.
5. Here the torch top was too close to the work.
It caused a portion of the inner cone of the
preheat flame to burn inside the top portion
of the cut. This produced an unstable cutting
action and resulted in the rough (small pockets
or gouges) edges at the top quarter of the
cut. Areas such as these must be machined
or ground to make them suitable for welding.
Flame Cutting Handbook.p65 5/9/2007, 8:06 AM 27