ESAB Cutmaster 40 Manual De Instrucciones página 62

ESAB CUTMASTER 40
In a Plasma Cutting Torch a cool gas enters
Zone B, where a arc between the electrode and
the torch tip heats and ionizes the gas. The
main cutting arc then transfers to the workpiece
through the column of plasma gas in Zone C.
By forcing the plasma gas and electric arc
through a small orifice, the torch delivers a
high concentration of heat to a small area. The
stiff, constricted plasma arc is shown in Zone
C. Direct current (DC) straight polarity is used
for plasma cutting, as shown in the illustration.
Zone A channels a secondary gas that cools the
torch. This gas also assists the high velocity
plasma gas in blowing the molten metal out of
the cut allowing for a fast, slag - free cut.
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Power
Supply
+
Typical Torch Head Detail
B. Gas Distribution
The single gas used is internally split into
plasma and secondary gases.
The plasma gas flows into the torch through
the negative lead, through the starter cartridge,
around the electrode, and out through the tip
orifice.
The secondary gas flows down around the
outside of the torch starter cartridge, and out
between the tip and shield cup around the
plasma arc.
C. Pilot Arc
When the torch is started a pilot arc is estab-
lished between the electrode and cutting tip.
This pilot arc creates a path for the main arc to
transfer to the work.
INTRODUCTION
A
B
Workpiece
C
A-00002
D. Main Cutting Arc
DC power is also used for the main cutting arc.
The negative output is connected to the torch
electrode through the torch lead. The positive
output is connected to the workpiece via the
work cable and to the torch through a pilot wire.
E. Parts - In - Place (PIP)
The torch includes a 'Parts - In - Place' (PIP) cir-
cuit. When the shield cup is properly installed,
it closes a switch. The torch will not operate if
this switch is open.
Torch Switch
To Control
Cable Wiring
A-02997
Parts - In - Place Circuit Diagram for Hand Torch
2T-2
Torch Trigger
PIP Switch
Shield Cup
300X5394