Miller Multimatic 220 - Stick (SMAW) Duty Cycle and Overheating; Static Characteristics Explained

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Complete Parts List is available at www.MillerWelds.com
4-11. Duty Cycle And Overheating For Stick (SMAW)
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A complete Parts List is available at www.MillerWelds.com
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1-6. Duty Cycle And Overheating For Stick (SMAW)
0
20
40
60
80
100
120
140
160
180
200
220
240
10 100
Output Amperes
% Duty Cycle
20
50
120V 15A
240V
120V 20A
Duty Cycle is percentage of 10 minutes that
unit can weld at rated load without
overheating.
If unit overheats, output stops. Wait fifteen
minutes for unit to cool. Reduce amperage or
duty cycle before starting to weld again.
NOTICE – Exceeding duty cycle can damage
unit and void warranty.
120V Input: 40% Duty Cycle At 90A
4 Minutes Welding 6 Minutes Resting
240V Input: 20% Duty Cycle At 185A
2 Minutes Welding 8 Minutes Resting
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
4-12. Static Characteristics
The static (output) characteristics of the welding power source can be described as flat during the GMAW process and drooping during the
SMAW and GTAW processes. Static characteristics are also affected by control settings (including software), electrode, shielding gas, weldment
material, and other factors. Contact the factory for specific information on the static characteristics of the welding power source.