Process Gouging - Lincoln Electric Tomahawk 1000 Operator's Manual

TOMAHAWK ® 1000
• The Post Flow time is proportional to the selected cutting
current and it is divided into 4 time ranges:
Selected Cutting Current
Less than 30A
Between 30A and 40A
Between 40A and 50A
Greater than 50A
• Pilot Arc
- The air will flow for a preflow time of 2 seconds and the pilot
arc will start. (Exceptions: the first time that the trigger is
pulled after the machine is turned on, or after a thermal, the
initial trigger will be ignored. This is a safety feature to
prevent the pilot arc from firing unexpectedly. The other
exception is if the machine is in postflow, then the preflow
time is skipped and the pilot arc will start immediately.)
- The pilot arc will run for 3.0 seconds and shut off unless the
arc is brought in contact with the work and the arc is
transferred. Avoid excessive pilot arc time by transferring the
arc to the workpiece quickly. This will extend consumable
life.
- When the arc is brought within 1/8" - 1/4" from the work
piece the arc will transfer, the current will ramp to the
setting on the control panel, and the cut can last indefinitely
(or until the duty cycle of the Tomahawk
exceeded).
• Pierce the work piece by slowly lowering the torch onto the
metal at a 300 angle away from the operator. This will blow
the dross away from the torch tip. Slowly rotate the torch to
vertical position as the arc becomes deeper.
TORCH AT 30
0 0
30 30
0
90
VERTICAL VER
FOR CUTTING FOR CUTTING
CUT
• Keep moving while cutting. Cut at a steady speed without
pausing. Maintain the cutting speed so that the arc lag is 10°
to 20° behind the travel direction.
Post Flow Time
15 seconds
20 seconds
25 seconds
30 seconds
®
1000 is
0
ANGLE
TO PIERCE
ROTATE TO
0
90 ANGLE TO CUT
TICAL ANGLE ANGLE
1/16"
• Use a 5° - 15° leading angle in the direction of the cut.
• Finish the cut to be made and release the trigger.
• If the dross is difficult to remove, reduce the cutting speed.
High speed dross is more difficult to remove than low speed
dross.

PROCESS GOUGING

Gouging is a process used to remove material without cutting
entirely through the workpiece. The Tomahawk 1000 has the
capability of performing plasma gouging with the proper
consumables attached to the torch. In general, gouging
consumables provide a wider plasma arc compared to a cutting
arc. As the material melts, it is blown forward by the pressurized
gas coming out of the torch. The dross will land on the surface of
the workpiece and can easily be removed after the gouging
process is complete.
Technique:
Hold the torch at a 45º angle to the workpiece. Pull the torch
trigger to start the gouging arc. As the material is removed move
the torch forward to continue removing material. When the
desired amount of material has been removed, release the torch
trigger to stop the gouging process.
Typically, the larger the angle between the torch and the
workpiece, the deeper and slower the gouging. As the torch angle
is decreased, less material is removed and the travel speeds can
be increased. Keeping the torch fixed while moving forward will
remove a straight line of material. Using a side-to-side, weaving
motion will remove a wider area of material. The output of the
Tomahawk 1000 can also be increased or decreased to control
the amount of material being removed. Most users tend to
maximize the output in order to remove the most material in a
short amount of time.
B-6
OPERATION
5 - 15 Leading Angle
Direction of Travel
10 - 20 Arc Lag