Lincoln Electric IM637 PRO-CUT 55 - Manual (Page 16)

B-3 OPERATION B-3
CUTTING CAPABILITY
The PRO-CUT 55 is rated at 55 amps, at 50% duty cycle on a 10 minute basis (runs 55 amps for 5 minutes, then
idling for 5 minutes) or 40 amps, at 100% duty cycle (continuous use). If the duty cycle is exceeded, a thermal
protector will shut off the output of the machine until it cools to the normal operating temperature.
Figure B.1 shows the cut capacity of the Pro-Cut 55 when cutting mild steel. The graph plots cut thickness vs.
torch travel speed with a torch standoff of 0.15". Example: 0.25” material may be cut at a setting of 35 amps at an
approximate speed of 38 IPM or at a setting of 45 amps at an approximate speed of 57 IPM or at a setting of 55
amps at an approximate speed of 62 IPM.
PRO-CUT 55
Lincoln's PRO-CUT 55
Mild Steel Cut Capacity Chart
Recommended T
orch T
ravel
Speed
(IPM)
80% of Maximum Speed
100
80
60
40
20
0
0.000 0.125 0.250 0.375 0.500 0.625 0.750
Material Thickness
25 A
35 A
45 A 55 A
Figure B.1
CONSUMABLE LIFE
The expected life for the Pro-Cut 55's electrode under normal operating conditions is approximately 50 to 60 min-
utes of cutting time at the machine
’ s maximum rated output. An erosion of approximately .060" in the electrode tip
is typi-cal for the end of electrode life, however, the electrode may last longer. A sustained green and erratic arc
will indicate definite electrode failure and both the electrode and nozzle should be replaced immediately.
It is recommended that consumables (electrode and nozzle) be replaced in complete sets. This will maximize the
performance of the PRO-CUT system.