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CUTMASTER 50+, CUTMASTER 70+
CAUTION
! !
Sparks from the cutting process can cause
damage to coated, painted, and other surfaces
such as glass, plastic and metal.
NOTE!
Handle torch leads with care and protect them
from damage.
Piloting
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.
Torch Standoff
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 will generally result in a
more square cut.
Edge Starting
For edge starts, hold the torch perpendicular
to the workpiece with the front of the tip
near (not touching) the edge of the work-
piece 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.
Direction of Cut
In the torches, the plasma gas stream swirls
as it leaves the torch to maintain a smooth
column of gas. This 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.
Left Side
Cut Angle
Side Characteristics Of Cut
48
Dross
4T.06
Standoff Cutting With Hand Torch
Right Side
Cut Angle
A-00512
TORCH OPERATION
To make a square - edged cut along an inside
diameter of a circle, the torch should move
counterclockwise around the circle. To keep
the square edge along an outside diameter
cut, the torch should travel in a clockwise
direction.
When 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 bot-
tom 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.
"High speed dross" usually forms a narrow
bead along the bottom of the cut edge and
is very difficult to remove. When cutting a
troublesome steel, it is sometimes useful to
reduce the cutting speed to produce "slow
speed dross". Any resultant cleanup can be
accomplished by scraping, not grinding.
Hand Torch Operation
NOTE!
For best performance and parts life, always use
the correct parts for the type of operation.
1.
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 protec-
tion. Choose the holding technique that
feels most comfortable and allows good
control and movement.
NOTE!
The tip should never come in contact with the
workpiece except during drag cutting operations.
2.
Depending on the cutting operation, do
one of the following:
a.
For edge starts, hold the torch
perpendicular to the workpiece
with the front of the tip on the edge
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