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Select MMA Welding Mode using the
Welding Mode Selection Knob (4) on the front
panel.
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Turn unit ON.
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In MMA Welding Mode only three para-
meters can be adjusted: welding current, Hot
Start and Arc Force.
Welding Current:
•
When MMA Mode is selected, Wel-
ding Current Light (D) is on.
•
Set Welding Current through the Wel-
ding Parameters' Regulation Knob (6).
The welding current should be chosen following
the instruction given by the electrodes manufac-
turer on the electrode box, but the following in-
dications may be useful as general information:
ELECTRODE DIAMETER
1.5mm
2.0 mm
2.5 mm
3.25 mm
4.0 mm
5.0 mm
Hot Start / Arc Force:
•
Press the SET Key (L) and select Hot
Start (M) or Arc Force (N) Light. The light
corresponding to the selected parameter
stays on.
•
Set Hot Start / Arc Force value throu-
gh the Welding Parameters' Regulation
Knob (6).
•
Push again the SET key (L) to con-
firm the set value and proceed with the
welding parameters setting. The unit will
automatically confirm the set value after 3
seconds and go back to the welding cur-
rent regulation.
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Protect your face with a mask or a hel-
met. Touch, with the electrode fastened, in
the electrode holder, the work piece until the
arc will be struck.
Avoid hammering the workpiece with the
electrode since it may loose the coating
and increase the arc striking difficulties.
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After striking the arc keep feeding the
electrode into the weld pool with an angle of
about 60° and moving left to right so that you
may control visually the welding. The length
of the arc can also be controlled by lifting or
lowering slightly the electrode. Also a varia-
tion of the welding angle may increase the
WELDING CURRENT
30 A - 40 A
50 A -65 A
70 A -100 A
100 A - 140 A
140 A - 160 A
160 A - 200 A
EN-8
size of the weld pool improving the capacity
of surfacing of the slag.
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At the end of the weld let the slag cool off
before removing it, using the brush-hammer.
CAUTION:
Protect your eyes when hitting the slag
with the chip hammer to avoid damages.
CAUTION:
A bad start can be due to the dirty
workpiece, a bad connection between
earth cable and work piece, or the bad
fastening of the electrode in the electro-
de holder.
7.0 QUALITY OF THE WELD
The quality of the weld will depend mainly on
the ability of the welder, on the type of weld
and on the quality of the electrode: Choose
the proper electrode before attempting to
weld, paying attention to the thickness and
composition of the metal to be welded.
Correct welding current.
If the current is too high the elctrode will burn
fast and the weld pool will be wide irregula-
rand difficult to be controlled. If the current is
too low you will lack power and the weld pool
will be narrow and irregular.
Correct arc length.
If the arc is too long it will cause spatters and
small fusion of the welding piece. If the arc is
too short the arc heat will be insufficient cau-
sing the electrode to stick to the workpiece.
Correct welding speed.
The correct welding speed will consent to
achieve a weld of proper width, without wa-
ves or craters.
8.0 TIG WELDING
The TIG process uses the electrical arc
struck between the tungsten electrode of the
torch and the work piece surface.
In TIG welding the torch is always con-
nected to the negative pole of the welder.
Welder preparation:
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Connect the earth cable to the positive
pole of the welder and the earth clamp to the
work piece.
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