Spirit II User’s Manual
Section 5: Torch Consumables and Cutting Charts
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5-5
Maximizing Consumable Life
Use the following guidelines to maximize consumable parts life:
1. The Spirit system utilizes the latest advancement in technology for extending the life
of the torch consumable parts. To maximize the life of the consumable parts, it is
imperative that the shutdown procedure of the arc is carried out properly.
The arc
must be extinguished while it is still attached to the workpiece.
A popping
noise may be heard if the arc extinguishes abnormally. Note that holes are usually
programmed without lead-outs to prevent loss of the arc during shutdown. There is
a time delay between the reception of a stop signal and when the arc is
extinguished. During this time, the gases and cutting current are changed to
optimum values for extinguishing the arc. Ideally, the x/y machine controller should
provide a plasma stop signal prior to the end of the cut path so the gases and
current reach the shut off values at the same time that the part has been completely
cut. The shutdown times are different for each current and are given below.
Arc Shutdown Times
Current (A) Time (ms)
30
490
50
390
70
300
100
300
150
175
200
195
260
175
275
175
400
375
2. Use the recommended pierce height given in the cutting charts. A pierce height that
is too low will allow molten metal that is ejected during the piercing process to
damage the shield cap and nozzle. A pierce height that is too high will cause the
pilot arc time to be excessively long and will cause nozzle damage. See “Piercing
Thick Materials” in Section 4.
3. Never fire the torch in the air. Nozzle damage will occur.
4. Make sure the torch does not touch the plate while cutting. Shield cap and nozzle
damage will result.
5. Use a chain cut when possible. Starting and stopping the torch is more detrimental
to the consumables than making a continuous cut.
6. Always use error tracking on the plasma console to keep track of cut errors. See
Section 4 for information on error tracking.
