Stick Welding - Helvi HF Série Manuel D'instructions Et D'entretien

6.0 STICk WELDING

General information
The electric arc may be described as a
source of bright light and strong heat;
in fact, the flow of electric current in the
gas atmosphere which surrounds the
electrode and the workpiece determines
the radiation of electromagnetic waves
that can be perceived as light and/or
heat depending on their wave length. At
an unperceivable level, the arc also pro-
duces ultra-violet and infra-red light; io-
nizing rays have never been noted. The
heat produced by the arc is used in the
welding process to melt and join metal
parts. The necessary electric current
is supplied by special equipment com-
monly called welding machine.
- Connect the earth cable to the negative
pole of the Inverter and the earth clamp to the
workpiece.
- Connect the welding cable to the positive
pole of the Inverter.
- Select MMA Welding Mode using the
Welding Mode Selection Knob (4) on the front
panel.
- Turn unit ON.
- 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.
Push the Welding Parameters' Regu-
•
lation Knob (6). The Light (D) blinks.
Set Welding Current.
•
MENU
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
65
4T
LIFT
2T
LIFT
MMA
A
4T HF
2T HF
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w
I b
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st I c f
f
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
Push again the Welding Parameters'
•
Regulation Knob (6) to confirm the set cur-
rent. The LED (D) is ON. To adjust again
the welding current, push once again the
Regulation Knob (6), the LED starts blin-
king. If set current is not confirmed, the
LED stops blinking after 3 seconds and
stays ON. By rotating the Regulation Knob,
the welding current can be changed, also
during welding, the LED will start blinking
again. To adjust the Hot Start and Arc For-
ce values, push the Regulation Knob (6)
and confirm the welding current setting.
Hot Start / Arc Force:
After setting and confirming the wel-
•
ding current, select Hot Start (L) or Arc
Force (M) Light by rotating the Parameters
Regulation Knob (6). The light correspon-
ding to the selected parameter stays on.
Push the Welding Parameters' Regu-
•
lation Knob (6). The Light (L or M) blinks.
MENU
Set Hot Start / Arc Force value.
•
Push again the Welding Parameters'
•
Regulation Knob (6) to confirm the set
current and proceed with the welding
parameters setting or the unit will auto-
matically confirm the set value after 3
seconds and go back to the regulation
sequence start. In this case it will be ne-
cessary to set the welding current again
before going to the regulation of the fol-
lowing welding parameters.
- Protect your face with a mask or a helmet.
Touch, with the electrode fastened, in the
electrode holder, the work piece until the arc
will be struck. (the inverter is featuring "hot
start" to improve the striking.
Avoid hammering the workpiece with the
electrode since it may loose the coating
and increase the arc striking difficulties.
- 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
1
4T
LIFT
2T
LIFT
MMA
A
4T HF
2T HF
I
w
I
b
I
st I
c f
f
25