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OPERATION
34
Manual 0-2470
4.06 OPERATING THE SYSTEM
Disconnect primary power at the source before disassembling
the power supply, torch, or torch leads.
Frequently review the Important Safety Precautions at the front
of this Manual. Be sure the operator is equipped with proper
gloves, clothing, eye and ear protection. Make sure no part of the
operator’s body comes into contact with the workpiece while the
torch is activated.
Sparks from the cutting process can cause damage to coated,
painted, and other surfaces such as glass, plastic and metal.
Handle torch leads with care and protect them from damage.
Piloting is harder on parts life than actual cutting because the
pilot arc is directed from the electrode to the tip rather than to a
workpiece. Whenever possible, avoid excessive pilot arc time to
improve parts life.
Improper standoff (the distance between the torch tip and
workpiece) can adversely affect tip life as well as shield cup life.
Standoff may also significantly affect the bevel angle. Reducing
standoff generally results in a more square cut. A specially
designed shield cup attachment is available for drag cutting,
which allows the operator to keep the torch in contact with the
workpiece during operation. Drag cutting also requires special
cutting tips.
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. When starting at the edge of the plate, do
not pause at the edge and force the arc to "reach" for the edge of
the metal. Establish the cutting arc as quickly as possible.
In the PCH/M-35 torch, the plasma gas stream swirls as it leaves
the torch. The purpose of the swirl is to maintain a smooth
column of gas. The swirl effect results in one side of a cut being
more square than the other. Viewed along the direction of travel,
the right side of the cut is more square than the left.
If dross is present on carbon steel, it is commonly referred to as
either “high speed, slow speed, or top dross”. Dross present on
top of the plate is normally caused by too great a torch to plate
distance. Top dross is normally very easy to remove and can
often be wiped off with a welding glove. Slow speed dross is
normally present on the bottom edge of the plate. It can vary
from a light to heavy bead, but does not adhere tightly to the cut
edge, and can be easily scraped off.
WARNING
WARNING
CAUTION
NOTE
Piloting
Torch Standoff
Edge Starting
Direction of Cut
Dross
Содержание CE CutMaster 50
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Страница 88: ...APPENDIX 84 Manual 0 2470 APPENDIX I SYSTEM SCHEMATIC A 00804 ...
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