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OM-1318 Page 10
2-3. Welding Power Source Duty Cycle And Overheating
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool. Reduce amperage or
duty cycle before welding.
Y Exceeding duty cycle can
damage unit or gun and void
warranty.
30% Duty Cycle At 130 Amperes
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 – SB-180 844
300
250
200
150
100
75
50
10 15 20 25 30 40 50 60 70 80 100
DC AMPERES
% DUTY CYCLE
3 Minutes Welding 7 Minutes Resting
2-4. Welding Gun Duty Cycle And Overheating
CAUTION
WELDING LONGER THAN RATED DUTY CYCLE can damage gun and void warranty.
• Do not weld at rated load longer than shown below.
• Using gasless flux cored wire reduces gun duty cycle.
warn7.1 8/93
Duty Cycle is percentage of 10
minutes that gun can weld at
rated load without overheating.
Continuous Welding
SB1.1 8/93
0
10
Minutes
Definition .023 To .045 in (0.6 To 1.1 mm)
Hard Or Flux Cored Wires
100% Duty Cycle At 100 Amperes
Using CO
2
.023 To .045 in (0.6 To 1.1 mm) Hard Or Flux Cored Wires
60% Duty Cycle At 100 Amperes
Using Mixed Gases
6 Minutes Welding 4 Minutes Resting