A40i, A60i
Manual 0-5466 OPERATION
4T-1
SECTION 4 TORCH:
OPERATION
4T.01 Machine and Automated Torch
Operation
Cutting With Machine or Automated Torch
These torches are activated by remote control pen-
dant or by a remote interface device such as CNC.
1. To start a cut at the plate edge, position the center
of the torch along the edge of the plate.
Travel Speed
Proper travel speed is indicated by the trail of the
arc which is seen below the plate. The arc can be
one of the following:
1. Straight Arc
A straight arc is perpendicular to the workpiece
surface. This arc is generally recommended
for the best cut using air plasma on stainless or
aluminum.
2. Leading Arc
The leading arc is directed in the same direction
as torch travel. A five degree leading arc is gener-
ally recommended for air plasma on mild steel.
3. Trailing Arc
The trailing arc is directed in the opposite direc-
tion as torch travel.
Standoff Distance
Straight Arc
Trailing Arc
Leading Arc
Direction of Torch Travel
A-02586
Automation and Machine Torch Operation
For optimum smooth surface quality, the travel
speed should be adjusted so that only the leading
edge of the arc column produces the cut. If the travel
speed is too slow, a rough cut will be produced as
the arc moves from side to side in search of metal
for transfer.
Travel speed also affects the bevel angle of a cut.
When cutting in a circle or around a corner, slowing
down the travel speed will result in a squarer cut.
The power source output should be reduced also.
Refer to the appropriate Control Module Operating
Manual for any Corner Slowdown adjustments that
may be required.
Piercing With Machine or Automated Torch
To pierce, 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.
4T.02 Automation Torch Parts Selection
Check the torch for proper consumable parts. The
parts supplied in the torch may not be correct for the
operator’s chosen amperage level. The torch parts
must correspond with the type of operation.
Torch parts:
Shield Cup, Cutting Tip, Electrode and Starter
Cartridge
NOTE!
Refer to Section 4T.07 and following for
additional information on torch parts.
Change the torch parts for a different operation as fol-
lows:
WARNING
Disconnect primary power at the
source before assembling or disassem-
bling torch parts, or torch and leads
assemblies.
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