Tig Welding - Helvi GLOBUS 175HF Manual De Uso

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 electrode will burn fast and the
weld pool will be wide irregular and 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 heta will insufficient causing the elctrode
to stick to the work piece.
Correct welding speed. The correct welding speed will consent to achieve a weld of
proper width, without waves or craters.

9.0 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 connected 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 work piece.
- Connect the tig torch to the negative pole of the welder and the gas hose to th
pressure regulator of the gas cylinder.
- Set Tig Welding using the Mode Pushbutton (4). Continue to press it to set the
desidered welding mode. The two red leds (6-7) will indicate the set mode as follows:
2 time glowing red led (6)
4 time glowing red led (7)
Note: pulsed mode is suitable for thin sheets of metal as heat on workpiece is
lower than in the standard mode
- Switch the inverter on.
10.0 TIG WELDING BY LIFT ARC
TIG welding without H.F. is suitable in all the cases when high frequency can cause
problems to devices in surrounding areas like hospitals, airports, etc... In all these
cases use Lift Arc Start.
- Ensure power source is OFF.
- Connect the earth cable to the positive pole of the welder and the earth clamp to
the 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.
2 time pulsed
4 time pulsed
blinking red led (6)
blinking red led (7)