Impax IM-TIG200 Instruction Manual page 31

TIG GUN ASSEMBLY
Know Your Torch
This TIG torch is designed to operate with the
IM-TIG200 welder for welding on steels or
stainless steels.
This torch is ideal for light fabrication,welding
repair and maintenance operations.
Electrode
The electrode must be ground as shown in
Fig.15 & 16. Do not use the grinding wheel used
for electrode grinding for any other purposes, as
contamination with other metals my cause
electrode deterioration and weld contamination.
The way in which the electrode tip is ground is
very important (Fig.15 & 16). If the tip is not
ground to the correct shape, the result will be
instability in the arc.
Fig 15
End Preparation
DCSP (EN)
General Purpose:
Flat:
1/4 to 1/2 x Diameter
Taper:
2 to 3 x Diameter
ACHF
General Purpose:
Ball:
Maximum 1 x Diameter
Ball tip by arcing on clean metal at low
current DCRP (EP) then slowly increase
current to form the desired ball diameter.
Fig 16
Grinding Preparation
Use a 60 Grit or finer aluminum oxide wheel
Shape tungsten by grinding logitudinally,
never radially.
Remove sharp point to leave a truncated
point with a flat spot. Diameter of flat spot
determines amperage.
The included angle determines weld bead
shape and size. Generally, as the included
angle increases, penetration increases and
bead width decreases.
When welding with A.C. current the end of the
electrode should be slightly rounded, the
electrode will shape itself in use, and further
grinding is not necessary. If the tip becomes
spherical when welding with A.C. current, it
indicates that the current is too high for the
elctrode diameter concerned.
To prevent damaging the collet, always ensure
that at least 9mm of the electrode is gripped by
the collet.
The electrode should not protrude more than
9mm from the nozzle except when acute angle
welding or using a gas lens.
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