OPERATION 4-8 Manual 0-2962
C. Piercing With Machine Torch
To pierce with a machine torch, the arc should be
started with the torch positioned as high as possible
above the plate while allowing the arc to transfer and
pierce. This standoff helps avoid having molten metal
blow back onto the front end of the torch.
When operating with a cutting machine, a pierce or
dwell time is required. Torch travel should not be
enabled until the arc penetrates the bottom of the
plate. As motion begins, torch standoff should be
reduced to the recommended 1/8 - 1/4 inch (3-6 mm)
distance for optimum speed and cut quality. Clean
spatter and scale from the shield cup and the tip as
soon as possible. Spraying or dipping the shield cup
in anti - spatter compound will minimize the amount
of scale which adheres to it.
4.09 Recommended Cutting Speeds
Cutting speed depends on material, thickness, and the
operator’s ability to accurately follow the desired cut line.
The following factors may have an impact on system
performance:
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NOTES
This information represents realistic expecta
-
tions using recommended practices and well
- maintained systems. Actual speeds may vary
up to 50% from those shown.
Refer to Appendix Pages for cutting speed
chart information as related to the Power Sup-
ply used.
4.10 Gouging
WARNINGS
Be sure the operator is equipped with proper
gloves, clothing, eye and ear protection and
that all safety precautions at the front of this
manual have been followed. Make sure no part
of the operator’s body comes in contact with the
workpiece when the torch is activated.
Disconnect primary power to the system be
-
fore disassembling the torch, leads, or power
supply.
CAUTIONS
Sparks from plasma gouging can cause dam-
age to coated, painted or other surfaces such
as glass, plastic, and metal.
Check torch parts. The torch parts must cor
-
respond with the type of operation. Refer to
Section 4.04, Torch Parts Selection.
A. Gouging Parameters
Gouging performance depends on parameters such as
torch travel speed, current level, lead angle (the angle
between the torch and workpiece), and the distance
between the torch tip and workpiece (standoff).
B. Torch Travel Speed
NOTE
Refer to Appendix Pages for additional informa
-
tion as related to the Power Supply used.
Optimum torch travel speed is dependent on current
setting, lead angle, and mode of operation (hand or
machine torch).
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