Tweco 1000 Merlin(Sept1999) - Manual (Page 35)

Manual 0-2731 31 OPERATION
Kerf Width
Cut Surface
Bevel Angle
Top Edge
Rounding
Cut Surface
Drag Lines
Dross
Build-Up
Top
Spatter
A-00007
Figure 4-7 Cut Quality Characteristics
Cut quality will vary on different types of and material
thicknesses. The following table shows the cut quality
that can be expected from this equipment for materials
with a thickness from gage to 1/2 inch (12.7 mm):
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 re-
moved), medium-smooth cut surface, slight top
edge rounding.
NR - Excessive bevel (over 10°), wide kerf (over 2-1/2 x
tip orifice diameter), medium to heavy dross, rough
cut surface, top edge rounding.
NOTES
Cut quality depends heavily on set-up and param-
eters such as torch standoff, alignment with the
workpiece, cutting speed, gas pressures, and op-
erator ability.
Table 4-A Cut Quality on Various Materials
Type of Material
Type of Gases Material Thickness Carbon Steel Stainless Aluminum
Gage Excellent Good - Excellent Good - Excellent
Air Plasma and
Air Secondary
Gage to 1 inch Excellent Good Good
1 to 1-1/2 inches Excellent Good Good
Gage NR Good - Excellent Good - Excellent
Nitrogen Plasma and
Air or CO2 Secondary
Gage to 1/2 inch NR Good - Excellent Good - Excellent
1/2 to 1 inch NR Good - Excellent Good - Excellent
Gage to 1/4 inch NR Good Good
Nitrogen Plasma and
Water Secondary
1/4 to 1/2 inch NR Excellent Good - Excellent
1/2 to 1-1/2 inches NR NR NR
Gage to 1/4 inch NR NR NR
Ar/H2 Plasma and
N2 or CO2 Secondary
1/4 to 1/2 inch NR Good Excellent
1/2 to 1 inch NR Good Good
Oxygen Plasma and
Air Secondary
Gage to 1 inch Excellent NR NR
Oxygen Plasma and
Oxygen Secondary
Gage to 1/4 inch Excellent NR NR