Prima PP 35 Manual De Uso página 9

CUTTING
A. Cutting with a Hand Torch
√
The torch can be comfortably held in one hand or steadied with two hands. Choose the technique
that feels most comfortable and allows good control and movement. Position the index fi nger or
thumb to press the control switch on the torch handle.
√
For edge starts, hold the torch perpendicular to the workpiece with the front of the tip on the
edge of the workpiece at the point where the cut is to start. - Fig. A. For piercing, angle the torch
slightly to direct sparks away from the torch until the pierce is complete. Fig. B
Fig. A
√
For drag cuts keep the torch in contact with the workpiece. For standoff cutting, hold the torch
2-3 mm from the work.
√
With the torch in starting position, press the control switch. After an initial gas purge (pre-air),
the pilot arc will come on and remain on for 3 seconds until the cutting arc starts.
√
Once on, the main arc remains on as long as
the control switch is held down, unless the torch
is withdrawn from the work or torch motion is
too slow. Keep moving while cutting. Cut at a
steady speed without pausing. Maintain the
cutting speed so that the arc lag is about 30°
behind the travel direction. Fig. C
If the cutting arc is interrupted, and the torch
trigger is still pressed, the pilot arc comes back
on automatically for 3 seconds.
√ To shut off the torch simply release the control switch. When the switch is released a post-fl ow
will occur. If the torch trigger is pressed during the post-fl ow, the pilot arc will restart.
B. Piercing with a Hand Torch
Note: Recommended maximum piercing capacity is 2mm. If necessary to make a cut on a
metal sheet with a tickness more than 2mm without an edge start, make a hole ø 6mm at
least using an electric drill to start cutting.
√ When piercing with a hand torch, tip the torch
slightly so that blowback particles blow away
from the torch tip (and operator) rather than
directly back into it. Fig. B
√
Complete the pierce off the cutting line and then
continue the cut onto the line. Hold the torch
perpendicular to the workpiece after the cut is
complete. Fig. D
Fig. B
Fig. B
Fig. C
Fig. D
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