Tweco 400 Ultra-Cut - Manual (Page 82)

OPERATION 4-8 Manual No. 0-5164
ULTRA-CUT 400
5. Use the AMPERAGE SET-UP control knob to set the desired amperage output. The module will update
the amperage every 2 seconds after the last adjustment to the knob. The module keeps the set point in
memory.
6. Place the MODE switch to the RUN position.
7. Set the Plasma Power Supply Enable / Disableswitch (on the Gas Control Module) to Enable. The Module
performs purges of 15 seconds, 11 seconds, and another 11 seconds. This removes water from the torch
parts.
NOTE
When switching gases between operations, allow enough purge time to clear the prior gas from the
torch leads.
CAUTION
While nothing prevents the operator from switching gases during piloting or cutting it is not recom-
mended to do so. If the operator switches gases during piloting or cutting, the power supply will
finish the cut with the first gas chosen. Then the gas control will switch to the new gas. Switching
gases during piloting or cutting may damage torch parts, torch leads, the control module, or the
piece being cut.
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.
Top-Edge Rounding
Rounding on the top edge of a cut due to wearing from the initial contact of the plasma arc on the workpiece.
Dross Build-up and Top Spatter
Dross is molten material which is not blown out of the cut area and re-solidifies on the plate. Top spatter
is dross which accumulates on the top surface of the workpiece. Excessive dross may require secondary
cleanup operations after cutting.