3.3 Possible applications
3.3.1 Cutting of perforated sheets
Interrupted cuts, for example, cutting of perforated sheets, gratings etc., can only
be carried out in “2-step” operating mode. The functional sequence is identical to
the sequence involved in “2-step” mode up to beginning of the hole.
Moving towards the beginning of the hole:
Cutting current interrupted and/or cutting arc extinguished.
Compressed air is reduced.
Pilot current flowing / pilot arc active.
Moving towards the end of the hole:
When contact with material is resumed, the cutting arc is ignited and the
compressed air increases.
If contact is not made with the work piece within four seconds, the equipment
switches itself off automatically (safety shutdown).
3.3.2 Hole-piercing
Place torch obliquely across the work piece and ignite. Then slowly move the
torch to a vertical position until the material is penetrated.
Since during hole-piercing the molten spray can be released from the
material before the arc has penetrated the full material thickness, the
torch nozzle is particularly highly stressed due to splash back of the
material and thermal reflex reflection.
If the material is too thick, it is recommended to drill an appropriately
sized through-hole in advance so that it is possible for the material to
flow.
3.3.3 Gouging
Hold torch at an appropriate slant depending on the desired depth of penetration
and move it forwards in the direction of the molten material. This will then be
blown out of the groove as a result of the plasma pressure.
Depending on the type of seam preparation or machining desired, various
nozzles and/or torch configurations can be used for gouging (see Chapter 4).
3.3.4 Weld preparation
Move torch with appropriate nozzle (see Chapter 4) out of the vertical position
towards the side until the deviation corresponds to the desired angle of the
chamfer. Maintain position and move torch with even, adjusted speed.
3.3.5 Circle cutting
Use of the circle cutting jig is recommended here in combination with the carriage
(see Chapter 4).
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