Tweco A80-A120 CutMaster - Manual (Page 20)

CUTMASTER A80, A120
INTRODUCTION Manual 0-5119
2T-2
E. Type Cooling
Combination of ambient air and gas stream
through torch.
F. Torch Ratings
Automated / Machine Torch Ratings
Ambient
Temperature
104° F
40° C
Duty Cycle
100% @ 100 Amps @ 400 scfh
80% @ 120 Amps @ 400 scfh
Maximum
Current
120 Amps
Voltage (V
peak
) 500V
Arc Striking
Voltage
7kV
Manual Torch Ratings
CUTMASTER A80
Ambient
Temperature
104° F
40° C
Duty Cycle 100% @ 100 Amps @ 400 scfh
Maximum
Current
120 Amps
Voltage (V
peak
) 500V
Arc Striking
Voltage
7kV
Manual Torch Ratings
CUTMASTER A120
Ambient
Temperature
104° F
40° C
Duty Cycle 100% @ 120 Amps @ 400 scfh
Maximum
Current
120 Amps
Voltage (V
peak
) 500V
Arc Striking
Voltage
7kV
G.Gas Requirements
Automated, Manual and Machine Torch Gas
Specifications
Gas (Plasma and Secondary) Compressed Air
Operating Pressure
Refer to NOTE
60 - 95 psi
4.1 - 6.5 bar
Maximum Input Pressure 125 psi / 8.6 bar
Gas Flow
(Cutting and Gouging)
300 - 500 scfh
142 - 235 lpm
!
WARNING
This torch is not to be used with oxygen (O
2
).
NOTE
Operating pressure varies with torch model, op-
erating 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.05 Introduction to Plasma
A. Plasma Gas Flow
Plasma is a gas which has been heated to an ex-
tremely 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 cut-
ting arc then transfers to the workpiece through
the column of plasma gas in Zone C.