Tweco CutMaster 10mm - Manual (Page 20)

cutmaster 10mm
INTRODUCTION 2T-2 Manual 0-5074
H. Gas Requirements
SL60 Torch Gas Specifications
Gas (Plasma and Secondary) Compressed Air
Operating Pressure
Refer to NOTE
60 - 75 psi
4.1 - 5.2 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.
I. Direct Contact Hazard
For exposed tip the recommended standoff is 3/16
inches / 4.7 mm.
2T.04 Options And Accessories
These items can adapt a standard system to a
particular application or further enhance perfor-
mance.
• Deluxe Cutting Guide Kit - Easy add - on
attachments for precise straight line, circle
cutting, and beveling. Includes carrying
case.
• Trigger Guard Kits - These offer additional
protection from accidental activation of the
torch switch.
• Leads Extensions for torches with ATC con-
nectors
• Leather Leads Covers
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 cutting arc
then transfers to the workpiece through the column
of plasma gas in Zone C.
A-00002
Workpiece
Power
Supply
+
_
C
B
A
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 allowing for
a fast, slag - free cut.