Tweco Max 300 w-TD-750 - Manual (Page 26)

OPERATION 20 Manual 0-2557
C. 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.
D. Top-Edge Rounding
Rounding on the top edge of a cut due to wearing
from the initial contact of the plasma arc on the work-
piece.
E. Bottom Dross Build-up
Molten material which is not blown out of the cut area
and re-solidifies on the plate. Excessive dross may
require secondary clean-up operations after cutting.
F. Kerf Width
The width of the cut (or the width of material removed
during the cut).
G. Top Spatter (Dross)
Top Spatter or dross on the top of the cut caused by
slow travel speed, excess cutting height, or cutting tip
whose orifice has become elongated.
H. Various Materials and Thicknesses
The following table defines the cut quality on various
materials and thicknesses:
Typical Cut Quality on Various Materials
Type of Material
Type of Gases Material Thickness Carbon Steel Stainless Aluminum
Air Plasma and
Air Secondary
Gauge to 2 inches
(Gauge to 50.8 mm)
Good Good Good
Gauge to 1/4 inch
(Gauge to 6.4 mm)
NR Good Good
1/4 to 1 inch
(6.4 to 25.4 mm)
NR Excellent Good - Excellent
1/4 to 1/2 inch
(6.4 to 12.7 mm)
NR NR Excellent
1/2 to 2 inches
(12.7 to 50.8 mm)
NR Excellent Excellent
Gauge to 3/8 inch
(Gauge to 9.5 mm)
Good NR NR
3/8 to 2 inches
(9.5 to 50.8 mm)
Excellent NR NR
Oxygen Plasma and
Air Secondary
Nitrogen Plasma and
Water Secondary
Ar/H2 Plasma and
N2 or CO2 Secondary
Description of Cut Characteristics:
Excellent - Minimum bevel (0 - 4°), minimum kerf (2 x tip orifice diameter), little or no dross, smooth cut surface.
Good - Slight bevel (0 - 10°), slightly wider kerf (2-1/2 x tip orifice diameter), some dross (easily removed), medium-
smooth cut surface, slight top edge rounding.
Fair - Excessive bevel (over 10°), wide kerf (over 2-1/2 x tip orifice diameter), medium to heavy dross, rough cut
surface, top edge rounding.
NR - Not Recommended.
NOTE
Cut quality depends heavily on set-up and parameters such as torch standoff, alignment with the workpiece, cutting
speed, gas pressures, and operator ability.