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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 or 40 amps, at 100% duty cycle.
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 Torch Travel 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 320
starts/cuts. An erosion of .060" is typical for end of electrode life, however, the electrode life may last longer. A
green and erratic arc will indicate definite electrode failure and the electrode should be replaced immediately.
It is recommended that consumables be replaced in complete sets. (Example: Electrode and Nozzle). This will
maximize the performance of the PRO-CUT system.