Tweco 211i Fabricator - Manual (Page 27)

INTRODUCTION FABRICATOR 211i
Manual 0-5157 2-3 INTRODUCTION
2.08 Duty Cycle
The rated duty cycle of a Welding Power Source, is a statement of the time it may be operated at its rated welding
current output without exceeding the temperature limits of the insulation of the component parts. To explain the 10
minute duty cycle period the following example is used. Suppose a Welding Power Source is designed to operate at a
20% duty cycle, 210 amperes at 24.5 volts. This means that it has been designed and built to provide the rated am-
perage (210A) for 2 minutes, i.e. arc welding time, out of every 10 minute period (20% of 10 minutes is 2 minutes).
During the other 8 minutes of the 10 minute period the Welding Power Source must idle and allowed to cool. The
thermal cut out will operate if the duty cycle is exceeded.
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220
FABRICATOR 211i
Welding Current (AMPS)
SAFE OPERATING REGION
(MIG, TIG & STICK)
0
0
10
20
30
40
60
70
50
80
100
90
Duty Cycle (PERCENTAGE)
MIG
STICK / TIG
Art # A-11265
Figure 2-2: Fabricator 211i Duty Cycle on 208/230V AC
Welding Current (AMPS)
Duty Cycle (PERCENTAGE)
Art # A-11274
0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
FABRICATOR 211i
SAFE OPERATING REGION
(MIG, TIG & STICK)
TIG
STICK
MIG
Figure 2-3: Fabricator 211i Duty Cycle on 115V AC