iWeld GORILLA POWERTIG 200 AC/DC GORILLA POWERTIG 200 AC/DC, User Manual

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3-2. Welding Modes Desription
3-2-1. MMA welding
t
t
I1
I2
I3
I2
t1 t2 t3 t2 t0
Hot Start Arc burning Arc Force Arc burning
Standby
U1
U2
Welding current
Welding voltage
I
U
Current and Voltage Change during MMA
Note :
t0: Standby : No welding current; output voltage is the no-load voltage (U2).
t1: Hot Start - Arc ignition phase: the value of arc ignition current is pre-programmed (I1).
t2: Arc burning : Welding current is the recommended, preset current (I2).
t3: Arc Force (Short-circuit transfer): the current value is the pre-set Arc Force current (I3).
In MMA mode, 3 parameters that can be adjusted directly. Describe them as below.
-
Hot Start - Arc ignition current (I1) and Arc ignition time (t1): Arc ignition current is the output
current of the machine when the arc is ignited. Arc ignition time is the time the arc ignition cur-
rent lasts. When in non-contact ignition mode, neither parameter makes sense.
- Welding current (I2): This is the welding current when arc is burning, and users can set it
according to heir own technical requirements.
- Arc force: It refers to the ascending slope of the current in short circuit, and it is set as the
amperage increased per millisecond in this machine. The current will ascend from the preset
value by this slope after short circuit occurs. (E.g. When the preset current is 100A and the arc
force is 20, the current will be 120A 5ms after short circuit occurs.) If it is still under short circuit
when the current increases to the allowable maximum value 160A, the current will not ascend
any more. If the short circuit status lasts for 0.8s or more, the machine will enter into Anti Stick
process: to wait the disconnection of the electrode under low current. Arc Force should be set
according to the electrode diameter, preset current and the technical requirement. If the arc
force is big, the molten drop can be transferred quickly, and electrode sticking seldom occurs.
However, too big Arc Force may lead to excessive spatter. If the Arc Force is small, there will
be little spatter, and the weld bead will be shaped well. However, too small Arc Force may
lead to soft arc and electrode sticking. Therefore, the Arc Force should be increased when
welding with thick electrode under low current. In general welding, the Arc Force may be set
at 5~50.
- Electrode selection:
Electrode diameter (mm) Recommended Welding
Current I2 (A)
Welding Voltage U1 (V)
1.6 30-60 21-23
2.0 50-90 22-24
2.5 80-120 23-25
3.2 100-140 24-26
4.0 140-160 26-28
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