Tweco 15XC Merlin - Manual (Page 45)

Manual 0-2251 4-11 OPERATION
4.4 GAS SELECTION FOR PLASMA CUTTING (continued)
Cut Characteristics:
Minimum bevel (0 - 4°), minimum kerf (2 x tip orifice),
little or no dross, smooth cut surface.
Slight bevel (0 - 10°), slightly wider kerf (2-1/2 x tip ori-
fice), some dross (easily removed), medium-smooth cut
surface, slight top edge rounding.
Excessive bevel (over 10°), wide kerf (over 2-1/2 x tip
orifice), medium to heavy dross, rough cut surface, top
edge rounding.
Not Recommended.
Cut quality depends heavily on set-up and parameters
such as torch standoff, alignment with the workpiece,
cutting speed, gas pressures, and operator experience.
Description
Excellent
Good
Fair
NR
NOTE
GAS
Air Plasma
Air Secondary
Nitrogen Plasma
Air Secondary
or CO 2 Secondary
Nitrogen Plasma
Water Secondary
Ar/H 2 Plasma
N 2 or CO 2
Secondary
Oxygen Plasma
Stainless Steel
Good/Excellent
Good
Good
Good/Excellent
Good/Excellent
Good/Excellent
Good
Excellent
NR
NR
Good
Excellent
Good
TYPE OF MATERIAL
Carbon Steel
Good/Excellent
Excellent
Excellent
Good/Excellent
Good/Excellent
Good/Excellent
Excellent
Good
NR
NR
NR
NR
Excellent
Aluminum
Good/Excellent
Good
Good
Good/Excellent
Good/Excellent
Good/Excellent
Good
Good/Excellent
NR
NR
Excellent
Excellent
NR
Table 4-C Cut Quality: Plasma and Secondary Gas Selection
for Various Materials and Material Thicknesses
MATERIAL
THICKNESS
Gage
Gage to 1 in.
1 to 2 in.
Gage
Gage to 1/2 in.
1/2 to 2 in.
Gage to 1/4 in.
1/4 to 1 in.
1 to 2 in.
Gage to 1/4 in.
1/4 to 1-1/4 in.
1/2 to 2 in.
Gage to 2 in.