Mma Operation - Impax IM-MMA130-IWK Manual

MMA OPERATION

The chart below is an indicator of the electrode
diameter and the corresponding welding
current. This is intended as a guide only as
results can vary depending on material, work
piece thickness, welding position and joint form.
Table 1
Electrode Welding
size (mm) voltage (V)
1.0 20.8 - 22.4
1.6 21.76 - 23.36 44 - 84
2.0 22.4 - 24.0
2.5 23.2 - 24.8
3.2 23.32 - 24.92 108 - 148
4.0 24.6 - 27.2
5.0 27.2 - 28.8
Connect to the mains supply and press the
On/Off switch (Fig.5) to the ON position ( l ).
Fig 5
The digital display will illuminate and the cooling
fan will operate. To stop the machine, press the
On/Off switch to the OFF position (O).
Fig 6
Press the MMA/TIG switch to MMA mode, Fig.6.
Set the amperage (see Table 1) by adjusting the
regulator knob (Fig.7) until the desired setting is
reached.
Fig 7
Welding
current (A)
20 - 60
60 - 100
80 - 120
Warning! Always wear a full face mask, welding
140 - 180
gloves and protective clothing. Wear goggles
while chipping slag.
180 - 220
Do not switch on the power supply until you are
ready to start welding. Practice welding on a
piece of scrap material.
Voltage Reduction Device
A voltage reduction device (VRD) is a hazard
reduction device that lowers the welder's open-
circuit voltage (OCV) to prevent electric shock
from welding current. A VRD is often combined
with stick welding machines used in damp
environments. The OCV is the voltage between
the electrode holder (or stinger) and the working
(or grounding) clamp when the welder is on, but
you are not welding. If you have a welding rod in
the stinger and the working clamp is connected,
the OCV is between the rod and the base metal.
Press the VRD button to turn ON, Fig.8. The VRD
indicator light will illuminate.
Fig 8
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