LOKERMANN GRAND ARC 400 CEL, User Manual, Page: 16 / 24

3.3.3 TIG Welding Fundamentals
Stricking the arc for TIG Operation: when tungsten electrode touches the workpiece, the short-
circuit current is only 28A . After generating arc, current can rise to the setting welding current. If
the tungesten electrode touches the workpiece when welding, the current will drop to 5A
within 2s,
which can reduce tungsten waste, prolong the using life of the tungsten electrode, and prevent
tungsten clipping.

Scraping arc

Tungsten Electrode Current Ranges
Electrode Diameter DC Current
1.0mm 25 - 85
1.6mm 50 - 160
2.4mm 160 - 250
3.2mm 250 - 400
4.0mm 400 - 500

Shielding Gas Selection
Alloy Shielding Gas
Carbon Steel Welding Argon
Stainless Steel Welding Argon
Nickel Alloy Welding Argon
Copper Welding Argon
Titanium Welding Argon

Tungsten Electrode Types
Electrode Type
(Ground Finish)
Welding Application Features Colour Code
Thoriated 2%
DC welding of mild steel,
stainless steel and copper.
Excellent arc starting, long life,
high current carrying capacity.
Red
Ceriated 2%
AC & DC welding of mild
steel, stainless steel, copper
aluminium magnesium and
their alloys.
Longer life, more stable arc,
easier starting, wilder current
range, narrower more concen-
trated arc.
Grey