Selco Genesis 60 Instrucciones De Uso página 26

Cause Incorrect welding/cutting mode.
Solution Increase the travel speed while welding/cutting.
Cause Worn nozzle and/or electrode.
Solution Replace the faulty component.
The nozzle overheats
Cause Insufficient air pressure.
Solution Adjust the air flow.
Read the paragraph "Installation".
Cause Worn nozzle and/or electrode.
Solution Replace the faulty component.
For any doubts and/or problems do not hesitate to contact
your nearest customer service centre.
7 PLASMA CUTTING THEORY
A gas becomes a plasma when it is brought to an extremely
high temperature and ionizes wholly or partly, thus becoming
electrically conductive.
Although the plasma exists in every electric arc, by the term
"plasma arc" we refer specifically to a torch for welding/cutting
that uses an electric arc passing through the constricting neck of
a suitable nozzle in order to heat a gas coming out of this same
nozzle, so as to bring it to the plasma state.
Manual plasma cutting unit
7.1 Plasma cutting process
The cutting action is performed when the plasma arc, made
very hot and highly concentrated by the design of the torch,
transfers onto the conductive piece to be cut, closing the elec-
trical circuit of the power source. The material is melted at the
high temperature of the arc, and then removed by the high
pressure flow of the ionized gas from the nozzle.
The arc can have two different states: the transferred arc,
when the current passes through the workpiece to be cut, and
the pilot arc or non-transferred arc, when this is established
between the electrode and the nozzle.
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