Tweco PAK 10 - Manual (Page 25)

Manual No. 0-0515 13 Operation
3.4 CUTTING CURRENT AND
SPEED SELECTION
The desired cutting current and the speed at which the
torch is moved along the line of the cut depend on the
thickness and composition of the workpiece. In hand
cutting, the speed is usually determined by how fast
the operator can comfortably and accurately follow the
line of the cut.
Most operators find that at speeds much above 30 ipm
it is difficult to accurately follow the line of the cut. For
machine cutting, faster speeds are often used. Refer to
Table 3-B.
This chart is intended as a guide to determining ap-
proximate conditions for making good quality cuts in
various thicknesses of material. Slower speeds may be
obtained on thin sections by reducing the current to
between 50 and 100 amperes.
The speeds shown are typical for cutting at 100 am-
peres using the 8-4153 (0.059) tip.
Plasma Gas - N2 at 30 psi (2.0 bar), 15 SCFH (7.1 lpm)
Secondary Gas - CO
2
or Compressed Air at 50 psi (3.4
bar), 250 SCFH (125.0 lpm)
NOTE
This information represents our best judgment
but Thermal Dynamics Corporation assumes no
liability for its use.
Table 3-B Recommended Cutting Speeds
THICKNESS 1/8" (3.2 mm) 1/4" (6.4 mm) 1/2" (12.7 mm) 3/4' (19 mm) 1" (25.4 mm)
Stainless
Steel
100 (2.54) 60 (1.52) 24 (0.61) 20 (0.50) 10 (0.25)
Aluminum 125 (3.18) 90 (2.29) 34 (0.86) 25 (0.63) 12 (0.30)
Carbon
Steel
75 (1.90) 45 (1.15) 24 (0.61) 18 (0.46) 9 (0.23)
INCHES/MINUTE (METERS/MINUTE)
Note: Speeds for Argon/Hydrogen Plasma Gas at 40 psi (2.7 bar), 30 SCFH (14.2 lpm)
with the 8-4170 LO-AMP tip at 100 amps are slightly faster. Argon/Hydrogen is not
recommended for cutting carbon steel.