PRO-POINT Harris M Manuel D'utilisateur page 12

V 1.0
CUTTING
Once the correct tip is tightly secured in the cutting torch, proper pressure set on the regulators, and a neutral flame is
present, follow these procedures to flame cut.
1. Before lighting, open oxygen needle valve on torch handle one full turn. Make all oxygen adjustments with
needle valve on cutting attachment.
2. Move the flame to the edge of the steel and position the preheat cones just above the metal.
3. When the steel becomes red, slowly depress the cutting oxygen lever to release the oxygen stream to cut
through the steel.
4. Slowly move the torch in the direction of the cut. The correct cutting speed is accompanied by a sputtering
sound, and a steady stream of sparks. This results in a clean, slag-free cut with square top and bottom edges.
5. Too fast a movement does not allow enough time for the oxygen stream to cut all the way through the metal.
Slag fills the kerf and the two pieces are not severed.
6. Too slow a movement leaves a rounded top edge with slag sticking to the bottom of the metal.
7. The size of the preheat flame determines how quickly the cut can be started. Often, a small preheat flame is
desirable to conserve gases, and prevent melting of the top edges.
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Harris Type Welder - Style M
PERFECT CUT
Shows regular surface with slightly sloping draglines. Surface can
be used for many purposes without machining.
EXTREMELY FAST
Not enough time is allowed for slag to blow out of the kerf.
Cut face is often slightly concave.
EXTREMELY SLOW
Produces pressure waves, which indicate too much oxygen for
cutting conditions.
TOO HOT PREHEAT
Rounded top edge caused by too much preheat. Excess preheat
does not increase cutting speed; it only wastes gases.
For technical questions call: 1-800-665-8685
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