OPERATION
5-17
HT4001 Instruction Manual
2. Convex cut face (top of cut rounded)
•
Caused by standoff distance being too high or cutting current being too high. Try
reducing the arc voltage and then the cutting current.
How to Get Longer Consumable Life
In order to optimize consumable life, follow these guidelines:
1. Pierce Height
The pierce height should be twice as much as the cutting height to prevent pierce splatter
from building up on the front of the nozzle and/or shield.
2. Pierce Delay
Pierce delay is determined and programmed on the machine interface. Allow enough
time for the pierce to be complete before starting the machine motion.
3. Ramp Down
In order to properly ramp down the gases to extend consumable life, the torch must end
its cut while over metal. The plasma arc and gas flows ramp down to an off state. If the
arc blows out without ramping down, the consumables lifetime will be decreased, This
can be a problem when cutting drop parts and the centers drop away leaving holes.
Under these conditions, there is no metal to be over in order to ramp down. However, in
this condition, blow out does not always occur. Sometimes the arc can stay attached to
the edge of the hole long enough to ramp down, removing only a small divot from the
workpiece. Running off the edge of the plate will also produce an arc blow out condition.
4. Electrode Life
•
Program the lead out when the drop part is the one wanted, but do not program the
lead out into the drop part.
•
Use a chain cut, if possible.
•
Purge the gas lines before cutting.
Summary of Contents for HT4001
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