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Parameters in MMA
There are 5 adjustable parameters in MMA welding, namely arc ignion current, arc ignion me, arc current, arc
characterisc (arc force) and arc breaking voltage. These parameters can be operated only through the control
panel. Select the desired welding mode before any operaon on parameters.
Arc ignion current (I1)
It is located at “inial segment-current column-current (A)”. It indicates the current during arc ignion
period, and can be adjusted within the full range.
Arc ignion me (t1)
It is located at “inial segment-voltage column-me (s)”, and it indicates the me arc ignion period
lasts.
Arc current (I2)
It is located at “peak segment-current column-current (A)”, and users can set it according to their own
technical requirements.
Arc characterisc (arc force)
It is located at “peak segment-current column-arc characterisc (-/+)”. It determines the rising rate of
I3, and it should be set according to the electrode diameter, preset current and the technical
requirement. If the arc force is large, the molten drop can be transferred quickly, and electrode scking
seldom occurs. However, too large an arc force may lead to excessive spaer. If the arc force is small,
there will be lile spaer, and the weld bead will be shaped well. However, too small an arc force may
lead to so arc and electrode scking. Therefore, the arc force should be increased when welding with
athick electrode under low current. In general welding, the arc force may be set at 20~70.
Simple TIG welding: Set the arc characterisc (arc force) at 0 in MMA welding, and simple TIG welding can
be carried out. Simple TIG welding is a kind of DC TIG welding achieved by users in MMA welding through
adding necessary gas path equipment connected to the welding machine and igning arc by scratching
the electrode.
Arc igni-
Arc burning
Short-
circuit
transfer
Arc
Welding current
Welding volt-
Time
I1
I2
I3
I2
U1
U0
t1
t3
t2
t2
Standby
Welding current and welding voltage in MMA
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