Welding With Coated Electrodes (Mma); Important; Welding Quality; Welding Current - Helvi COMPACT 400 Manuel D'instruction

WELDING WITH COATED
ELECTRODES (MMA)
• Connect the ground lead to the negative (-)
Dinse socket of the generator (pos. 4) and
the ground clamp to the piece which is to be
welded.
• Connect the welding cable to the positive
(+) Dinse socket of the generator (pos. 5) and
correctly fi x the coated electrode (fi ller mate-
rial) on the electrode holder.
Warning: Respect the positive or nega-
tive polarity (DC+, DC-) marked on the
packaging of the electrodes.
• While holding the electrode holder, sup-
ply the generator with power by pressing the
start/stop (ON/OFF) button on the rear panel
(pos. A) of the generator. Warning: The wel-
ding machine will suggest the confi gurations
used in the previous welding
• Use the button in pos. 14 to select the elec-
trode welding procedure (MMA).
• Use the button in pos. 16, 16A or 16B (de-
pending on the generator) to select "menu"
or "set" (depending on the generator) and set
the Hot Start and Arc Force parameters:
• Hs/Af LED (or Hs LED only) on with fi -
xed light – the display shows "H": rotate the
adjustment knob pos. 2 to adjust the Hot
Start value. The display will show the set
value.
• Hs/Af LED (or Af only) fl ashing or fi xed
(depending on the generator) – The display
shows "A": rotate the adjustment knob pos.
2 to adjust the Arc Force value. The display
will show the set value.
• Use button 15A, 15B, 16 or 16B (depen-
ding on the generator) to activate or exclude
the VRD function.
IMPORTANT: For further information on
parameter functions and regulation in
MMA welding, please read the paragraph
on "WELDING PARAMETER CONTROL
PANEL".
• Wait 5 seconds. The generator will exit the
automatic parameter regulation menu.
• Adjust the welding current using the knob
pos. 2 (lw LED on) or with the remote control
knob if the remote control has been activated
with button pos. 8 (fl ashing lw LED).
• The set current value depends on the ap-
plication of the welding, the type of electrode,
its diameter and on the instructions provided
by the electrode manufacturer (and present on
the packaging of the electrodes themselves).
30
• The table below contains basic information
regarding the range of currents used for each
diameter of electrode.
The following instructions can be useful for
good welding results:
Electrode diameter Welding current
1.5mm
2.0m
2.5m
3.25mm
4.0mm
5.0mm
6.0mm
• Delicately use the electrode (to avoid de-
terioration of the coating) to touch the piece
which is to be welded, to trigger the electric
arc.
• After triggering the arc, keep the electrode
in position at an angle of about 45° and move
it from left to right to control the arc and the
welding range.
• The length of the arc is a function of the
electrode/piece distance.
• Variations on the welding angle may incre-
ase the size of the welding area, improving
the covering capacity of the slag.
• When the welding is completed, allow the
residue to cool down before removing it with
a toe-ended brush.
Warning:
• Protect your eyes;
• Avoid injuries to you and other personnel
when removing the residue with the toe-
ended brush.
Warning!
A bad start can be caused by dirt on the
material to be welded, by the incorrect
connection between the ground lead and
the piece to be welded, or by the impro-
per fi xing of the electrode holder.

WELDING QUALITY

The quality of the welding depends mainly on
the skill of the welder, the type of welding (pi-
ping, plates etc) and the quality of the electro-
de. Prior to welding, select the most suitable
model and diameter of electrode, being par-
ticularly careful regarding its thickness, the
composition of the metal to be welded and
the welding position (fl at, front, descending/
ascending vertical etc).

WELDING CURRENT

30A - 50A
50A - 65A
70A - 100A
100A - 140A
140A - 180A
180A - 240A
240A - 270A