Tweco 100 Auto-Cut - Manuel (Page 50)

OPERATION 4-4 Manual 0-4764
J. Pressure and Flow Settings
1. Refer to the Torch manual for pressure and flow details according to the material being cut. Move the RUN/
SET switch to SET position. (Gas will flow through the torch). Set gas pressures and flows as follows:
2. To set the Plasma Gas pressure:
a. Pull out the knob on the Plasma Gas pressure control knob.
c. Turn the knob to adjust gas pressure.
d. Push the knob back in to lock the pressure setting.
3. To set the Shield Gas pressure: Set the Shield Mode Selector switch to the GAS or H
2
O MIST position.
For Gas Shield:
a. Pull out the Shield Gas Pressure Control Knob.
c. Turn the knob to adjust gas pressure.
d. Push the knob back in to lock the pressure setting.
For H
2
O MIST Shield:
a. Turn the Water Mist Control Knob to adjust pressure.
b. Push the knob back in to lock the pressure setting.
NOTE
Unless the installation includes gas selection equipment between the gas supplies and the control console, switching
between gases requires disconnecting the gas supply line(s) from the control console rear panel and connecting
the appropriate input gases. Water input can remain connected permanently because the shield selector switch
disables and enables the flow of water for H
2
O Mist shield.
4. Place the RUN/SET switch to the RUN position.
4.04 Cut Quality
Cut quality requirements differ depending on application. For instance, nitride build-up and bevel angle may
be major factors when the surface will be welded after cutting. Dross-free cutting is important when finish cut
quality is desired to avoid a secondary cleaning operation. Cut quality will vary on different materials and
thicknesses.
Right Side
Cut Angle
Left Side
Cut Angle
A-00512
Kerf Width
Cut Surface
Bevel Angle
Top Edge
Rounding
Cut Surface
Drag Lines
Dross
Build-Up
Top
Spatter
A-00007
Cut Surface
The condition (smooth or rough) of the face of the cut.
Bevel Angle
The angle between the surface of the cut edge and a plane perpendicular to the surface of the plate. A per-
fectly perpendicular cut would result in a 0° bevel angle.