Quality Of The Weld; Tig Welding - Helvi HF Série Manuel D'instructions Et D'entretien

size of the weld pool improving the capacity
of surfacing of the slag.
- 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:
- Connect the earth cable to the positive
pole of the welder and the earth clamp to the
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work piece.
- Connect the TIG torch to the negative
pole of the welder and the gas hose to the
pressure regulator of the gas cylinder.
The flow of the gas is automatically con-
trolled using the knob of welding para-
meters' regulation (6). Use inert gas (ar-
gon ) only.
- Turn the inverter on.
8.1 WELDING MODE SELECTION
- Select the welding mode, 4T LIft, 2T Lift,
4T HF or 2T HF using the Welding Mode
Selection Knob (4) on the front panel.
- Your welder allows to activate the Pulse
Function in both 2T and 4T Welding Modes:
Select Pulse Mode Selection Light by
•
rotating the Welding Parameters' regula-
tion Knob (K). The light corresponding to
the selected parameter will stay on. The
display views "ON" if Pulse Mode is acti-
vated, "OFF" is Pulse Mode is not active.
Push the Welding Parameters' Regu-
•
lation Knob (6). The Light (K) blinks.
To change setting push again the the
•
Regulation Knob (6).
The unit automatically confims the set
•
value after 3 seconds and go back to the
regulation sequence start. Welding Cur-
rent Light (D) is on.
The Pulse Light stays on if Pulse Fun-
•
ction is activated, off if not activated or
MMA Mode is selected.