Specifications; 04 Options And Accessories; 05 Introduction To Plasma - ESAB Cutmaster 120 Manual De Instrucciones

ESAB CUTMASTER 120
F. Torch Ratings
Manual Torch Ratings
Ambient 104° F
Temperature 40° C
Duty Cycle 100% @ 120 Amps @ 400 scfh
Maximum Current
120 Amps
Voltage (V ) 500V
peak
Arc Striking Voltage 7kV
Mechanized Torch Ratings
Ambient 104° F
Temperature 40° C
Duty Cycle 100% @ 120 Amps @ 400 scfh
Maximum Current 120 Amps
Voltage (V ) 500V
peak
Arc Striking Voltage 7kV
G. Gas Requirements
Manual and Mechanized Torch Gas

Specifications

Gas (Plasma and Secondary) Compressed Air
Operating Pressure 60 - 95 psi
Refer to NOTE 4.1 - 6.5 bar
Maximum Input Pressure 125 psi / 8.6 bar
Gas Flow (Cutting and 300 - 500 scfh
Gouging) 142 - 235 lpm
WARNING
!
This torch is not to be used with
oxygen (O )
2
NOTE!
Operating pressure varies with torch
model, operating amperage, and
torch leads length. Refer to gas
pressure settings charts for each
model.
H. Direct Contact Hazard
For standoff tip the recommended standoff is 3/16
inches / 4.7 mm.
2T.04 Options And Accessories
For options and accessories, see section 6.
2T-2
INTRODUCTION
2T.05 Introduction to Plasma
A. Plasma Gas Flow
Plasma is a gas which has been heated to an
extremely high temperature and ionized so that it
becomes electrically conductive. The plasma arc
cutting and gouging processes use this plasma to
transfer an electrical arc to the workpiece. The metal
to be cut or removed is melted by the heat of the arc
and then blown away.
While the goal of plasma arc cutting is separation of
the material, plasma arc gouging is used to remove
metals to a controlled depth and width.
In a Plasma Cutting Torch a cool gas enters Zone B,
where a pilot 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.
_
Power
A
Supply
+
B
Workpiece
C
A-00002
Typical Torch Head Detail
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 allow-
ing for a fast, slag - free cut.
B. Gas Distribution
The single gas used is internally split into plasma
and secondary gases.
Manual 0-5398
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 established
between the electrode and cutting tip. This pilot arc
creates a path for the main arc to transfer to the work.
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 con-
nected 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) circuit.
When the shield cup is properly installed, it closes
a switch. The torch will not operate if this switch is
open.
Torch Switch Torch Trigger
To Control
Cable Wiring
PIP Switch
Shield Cup
A-02997
Parts - In - Place Circuit Diagram for Hand Torch
Manual 0-5398 INTRODUCTION
ESAB CUTMASTER 120
Remote Pendant
PIP Switch
Shield Cup
To ATC
CNC Start
PIP Switch
To ATC Shield Cup
Automation Torch
PIP Switch
To ATC Shield Cup
Parts - In - Place Circuit Diagram for Machine Torch
2T-3