Tweco Maximizer 300 Torch for BNFL - Manual (Page 26)

OPERATION 4-4 Manual 0-2990
H. Various Materials and Thicknesses
The table defines the cut quality on various materi-
als and thicknesses:
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 setup 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 in Section 1 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.
A. Piloting
Piloting is harder on parts life than actual cutting be-
cause the pilot arc is directed from the electrode to
the tip rather than to a workpiece. Whenever pos-
sible, avoid excessive pilot arc time to improve parts
life.
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