SPT SPARCIN 4000, Manual, Page: 28 / 51

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Sporadic slag adherence

Worn or damaged consumables. Check the and replace if necessary.

This type of slag can depend on the material that is being cut. It is not possible to cut
without slag adherence in all materials.

The slag can arise as a result of the material temperature. As the cutting in the work
piece proceeds the temperature rises and the slag adherence also increases.
The cut surface
The surface can be either convex or concave. A proper adjustment of the speed and distance
can help in getting a straighter cut.
Concave surface

Too little distance between torch and work piece. By raising the torch the surface
becomes straighter.
Convex surface

Too much distance between torch and work piece or too high current. First try to
straighten the cut by lowering the torch. If this does not help, try to lower the cutting
current. Some combinations of material and cutting gas can result in convex cuts.
Optimizing the consumable life time
The liquid cooled torch and its patented parts guarantee the longest possible life time and
optimum cutting economy. However, to optimize the life time the following instructions must
be followed.
Optimizing the electrode life time

When piercing the torch must not be too close to the work piece.

Program the cutting sequence so that the plasma arc goes out while it still has contact
with the work piece. If the end of the cut is outside the plate or in a hole the electrode
life time is dramatically reduced.

The electrode life time can be prolonged if the cutting is programmed so that several
details are cut in one sequence without restarting the arc, and thereby reducing the
number of starts.

Always flush the gas system when changing gas.
Optimizing the nozzle/shield life time

When piercing the torch must not be too close to the work piece. The piercing distance
must be minimum double the cutting distance to avoid molten material spattering back
onto the torch. Refer to the cutting charts.

A torch height distance control must be in operation so that the distance between torch
and work piece is kept constant.