OM-227 978 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 − 227 953-A
30% duty cycle at 150 amps
3 Minutes Welding 7 Minutes Resting
10
20
40
60
80
100
200
130
175
60 8070 10010 20 4030
Output Amperes
Duty Cycle %
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 − 227 954-A
0
5
10
15
20
25
30
35
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230
1
2
3
4
5
6
7
Amperage
Voltage
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