Tweco PCM-120 Machine Torch - Manual (Page 24)

OPERATION 4-4 Manual 0-2698
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
Chart in Figure 4-5 defines the cut quality on vari-
ous materials and thicknesses:
Cut Quality on Various Materials
Types of Material
Type of Gases Material Thickness Carbon Steel Stainless Aluminum
Air Plasma and Gage Excellent Good-Excellent Good-Excellent
Air Secondary Gage to 1 inch Excellent Good Good
1 to 1-1/2 inch Excellent Good Good
Nitrogen Plasma Gage NR Good-Excellent Good-Excellent
and Air or CO2 Gage to 1/2 inch NR Good-Excellent Good-Excellent
Secondary 1/2 to 1-1/2 inch NR Good-Excellent Good-Excellent
Ar/H2 Plasma and Gage to 1/4 inch NR NR NR
N2 or CO2 1/4 to 1-1/4 inch NR Good Excellent
Secondary 1/2 to 1-1/2 inch NR Good Excellent
Figure 4-5 Cut Quality
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 param-
eters such as torch standoff, alignment with the
workpiece, cutting speed, gas pressures, and op-
erator ability.
4.06 Operating the System
WARNINGS
Disconnect primary power at the source before dis-
assembling the power supply, torch, or torch leads.
Frequently review the Important Safety Precau-
tions at the front of this manual. Be sure the op-
erator is equipped with proper gloves, clothing, eye
and ear protection. Make sure no part of the
operator’s body comes into contact with the work-
piece while the torch is activated.
Sparks from the cutting process can cause damage
to coated, painted, and other surfaces such as glass,
plastic and metal.
Handle torch leads with care and protect them from
damage.