Helvi COMPACT 306HF Manual Del Usuario página 49

WELDING WITH COATED
ELECTRODES (MMA)
• Connect the ground lead to the negative
(-) socket of the generator (pos. 4) and the
ground clamp to the piece which is to be wel-
ded.
• Connect the welding cable to the positive
(+) socket of the generator (pos. 5) and cor-
rectly fix the coated electrode (filler material)
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 configurations
used in the previous welding
• Use the buttonT2 to select the electrode
welding procedure (MMA).
• Use the button T5 to select "set" and set
the Hot Start and Arc Force parameters:
• Hs/Af LED L22 on with fixed light – the
display shows "H": rotate the adjustment
knob 2 to adjust the Hot Start value. The
display will show the set value.
• Hs/Af LED L22 flashing – The display
shows "A": rotate the adjustment knob 2 to
adjust the Arc Force value. The display will
show the set value.
• Use button T5 to activate or exclude the
VRD function.
IMPORTANT: For further information on
parameter functions and regulation in
MMA welding, please read the paragraph
on "CONTROL PANEL - BUTTONS &
LEDS".
• Wait 5 seconds. The generator will exit the
automatic parameter regulation menu.
• Adjust the welding current using the knob 2
(LED L2 on) or with the remote control knob
if the remote control has been activated with
button T1 (LED L1 on).
• 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).
• The table below contains basic information
regarding the range of currents used for each
diameter of electrode.
Electrode diameter Welding current
1.5mm
2.0m
2.5m
3.25mm
4.0mm
5.0mm
6.0mm
The following instructions can be useful for
good welding results:
• 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 fixing 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 (flat, front, descending/
ascending vertical etc).
30A - 50A
50A - 65A
70A - 100A
100A - 140A
140A - 180A
180A - 240A
240A - 270A
Tab.4
EN-13