17
10.0 TIG WELDING BY LIFT ARC
FIG.b
FIG.c
FIG.d
-Connect the earth cable to the positive pole of the welder and the earth clamp to
thework piece.
-Connect the tig torch to the negative pole of the welder and the gas hose to
thepressure regulator of the gas cylinder.
Globus 201/201C: The gas fl ow is manually controlled by using the knob on
the torch handle.
Globus 211: The gas fl ow is automatically controlled using the post gas
potentiometeron the front panel.Use inhert gas (argon) only.
- Set the slope down time considerating the value of the weld current and the
thicknessof the material (low current=low slope down time ; high current = high
slope downtime (Globus 211 only).
- Set the welding current considering the thickness of the material to be welded
andof the diameter of the tungsten electrode to be used.
- Switch the inverter on.
- Covering your face with a mask or a helmet, bring the tungsten electrode of thetorch
within 3 or 4 mm of the work piece keeping it at an angle of 45° , push the torchtrigger
(fi g. a) and touching it with the ceramic nozzle (fi g. b).
- With a rapid movement short - circuit the tungsten electrode (fi g. c) and go back
to a distance of 3-4 mm (fi g. d). The arc will be struck developing a hot and intense
light.Advance the torch maintaining the same distance from the work piece and
proceeding right to left.
- To stop the weld release the torch trigger or lift the torch from the work piece. In the
fi rst case the output current decreases to zero in a slope down time before adjusted
(Globus 211), in the second case the current stops immediately (Globus 201/201C).
