develops a pit in the end of the electrode, when the pit becomes too much poor quality cuts will result
and necessitate replacement of the electrode.
7 Air quality,
Air
pressure
and
volume
Compressors take in air at atmospheric pressure and increase the pressure and store it in a tank.
Moisture that forms in air lines has a tendency to condense into larger drops when the air pressure
decreases as it is entering the plasma torch. When these droplets enter into the high temperatures in
the plenum of the torch, they immediately break down into oxygen and hydrogen, which alters the
normal chemical content of air in the torch. These elements will then dramatically change the plasma
arc which causes the torch consumable parts to wear very quickly, alters the shape of the nozzle
orifice, dramatically affecting cut quality in terms of edge squareness, dross formation, and edge
smoothness.Air pressure, flow rate and air quality are critical to quality plasma cutting and consumable
life span.Usually air pressure is preset at 60 psi . The volume capacity of your compressor is important,
If you are doing a lot of cutting, cutting thick plate (same air consumption but slower cut speeds =
longer cut time) then choose a compressor at 1.5 to 2 times the plasma system requirement.
3.4 Hand torch cutting Show
Torch tip height & position
① ② ③ ④
①
The correct torch height and right angle shall be consistent with the minimum slope and equal slope of the material, so
as to ensure good cutting effect and prolong the service life of consumables.
②
Torch angled to the material unequal bevel, one side may be excessively beveled.
③
Torch height too high, plasma stream may not cut all the way through the material.
④
Torch height too low. Tip may contact the work piece and short out or damage the tip.
Speed and Amperage
When cutting, select the appropriate
current and pushing speed according
to the material and thickness of the
workpiece to ensure that the spark
are exiting from the bottom of the
workpiece
If the spark comes out from the top of the
workpiece, it means that the workpiece
has not been completely cut, because the
torch moves too fast or the current is set
too low.
If the spark passes vertically through
the workpiece, it indicates that the
workpiece has been completely cut
off and the torch is cutting air
because the torch moves too slowly
or the current setting is too large
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