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OM-228 187 Page 12
4-2. Duty Cycle And Overheating
Duty Cycle is percentage of 10
minutes 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.
NOTICE − Exceeding duty cycle
can damage unit or gun and void
warranty.
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 − 217 757-A
30% duty cycle at 130 amps, 60 Hz
20% duty cycle at 130 amps, 50 Hz
3 Minutes Welding 7 Minutes Resting
10 20 30 40 50 60 70 80 100
10
20
40
60
80
100
130
175
200
Duty Cycle %
Output Amperes
4-3. Volt-Ampere Curves
The volt-ampere curves show the
minimum and maximum voltage
and amperage output capabilities of
the welding power source. Curves
of other settings fall between the
curves shown.
ssb1.1 10/91 − 228 183-A
0
5
10
15
20
25
30
0 10 20 30 40 50 60 70 80 90 100 110 120 13 0 140 150 160 170 180 190 200
1
2
3
4
5
6
7
Amperage
Voltage