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2.1 MMA Display
1. Welding mode button
Press it to enter MMA welding mode.
2. Left parameter knob
Rotate it to welding current.
3. Right parameter knob
Press it to select Hot Start or Arc Force and rotate it to adjust values.
Hot start
Hot start provides extra power when the weld starts to counteract the high resistance of the electrode
and workpiece as the arc is started. Setting range: 0~10.
Arc force
An MMA welding power source is designed to produce constant output current. This means with
different types of electrode and arc length; the welding voltage varies to keep the current constant.
This can cause instability in some welding conditions as MMA welding electrodes will have a minimum
voltage they can operate with and still have a stable arc.
Arc Force control boosts the welding power if its senses the welding voltage is getting too low. The
higher the arc force adjustment, the higher the minimum voltage that the power source will allow. This
effect will also cause the welding current to increase. 0 is Arc Force off, 10 is maximum Arc Force. This is
practically useful for electrode types that have a higher operating voltage requirement or joint types that
require a short arc length such as out of position welds.
