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OPERATION
Choosing the 4T option locks the torch in the
ON (fire) position. With the 4T option selected,
press the trigger to fire the torch. You can then
release the trigger while continuing to cut. Press
the trigger again to stop the arc. The arc also
stops if you lose transfer.
Cutting
Note: For best performance and parts life,
always use the correct parts for the type of
operation.
The torch can be comfortably held in one hand
or steadied with two hands. Position the hand to
press the Trigger on the torch handle. With the
hand torch, the hand may be positioned close to
the torch head for maximum control or near the
back end for maximum heat protection. Choose
the holding technique that feels most
comfortable and allows good control and
movement.
As a general rule for cutting amperages below
40A the cutting tip can be dragged on the
cutting surface. Higher amperages require a
standoff distance and torch manufacturers
normally supply a stand-off guide or 'drag
shield'. Some operators prefer to use an
extended electrode to improve visibility when
cutting. Guides can be purchased to assist in
straight line, circular and bevel cutting.
For straight edge cutting the torch should be
held at a 90° angle to the plate and dragged
along the plate (Fig.8).
Fig 8
The cutting speed will depend on the material
thickness, amperage and airflow rate.
For bevel cutting the torch should be angled on
the plate to the required bevel angle and
dragged on the plate surface. (Note that the
bevel angle will influence the material thickness).
Piercing and Gouging
To pierce material the cutting torch should be
held at an angle of 45° to the pierce surface
(Fig.9).
Fig 9
Once the arc is established the torch is turned
to 90° (Fig.10) and cutting is carried out in a
normal manner.
Fig 10
Piercing thickness is dependent on the output of
the machine and is generally 50% of the rated
cutting thickness of the power source.
It is important to direct the arc away from the
operator when establishing the arc as sparks
and molten material will be ejected from the
point of contact. Care must also be taken to
protect the surrounds from these sparks.
When gouging with plasma it is advisable to use
a plasma gouging tip supplied by the torch
manufacturer. The torch should be held at an
angle of 40–45° from the plate surface (Fig.11).
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