Welding Gun Duty Cycle And Overheating; Volt-Ampere Curves - Miller Millermatic 250X Owner's Manual

2-3. 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.
Definition
0
10
Minutes
Duty Cycle is percentage of 10
minutes that gun can weld at
rated load without overheating.

2-4. Volt-Ampere Curves

35
30
25
20
15
10
5
0
0 100
OM-1320 Page 10
.023 To .045 in (0.6 To 1.1 mm)
Hard Or Flux Cored Wires
100% Duty Cycle At 200 Amperes
Using CO
2
100% Duty Cycle At 150 Amperes
Using Mixed Gases
Continuous Welding
200 300
AMPERES
.023 To .045 in (0.6 To 1.1 mm) Hard Or Flux Cored Wires
60% Duty Cycle At 300 Amperes
Using CO
60% Duty Cycle At 200 Amperes
Using Mixed Gases
6 Minutes Welding
1 Normal Volt-Ampere Curves
The volt-ampere curves show the
normal minimum and maximum
1
voltage and amperage output capa-
bilities of the welding power source.
Curves of other settings fall be-
tween the curves shown.
400
warn7.1 8/93
2
4 Minutes Resting
SB1.1 8/93
ssb1.1 10/91 – 196 844 / S-0700