Miller XMT 300 CC/TIG Manuale d'uso - Pagina 33

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Miller XMT 300 CC/TIG Manuale d'uso
8-2.
Preparing Tungsten
Figure
8-1.
Preparing Tungsten
For AC Or DC Electrode
Positive
(DCEP) Welding
a
CAUTION
~
FLYING SPARKS AND HOT
METAL
can cause
injury
and
start
fires.
Shape
tungsten
electrode
only
on
gnnder
with
properguards
in
a
safe
location
wearing
proper
face, hand,
and
body protection.
Keep
flammables away.
warn2.1 9/91
Ref.
S-0161
1
1
Stable Arc
c1~
2
2
Flat
4
3
Diameter of this flat determines
amperage
capacity.
3
Grinding
Wheel
4
Straight
Ground
Ideal
Tungsten Preparation
Stable Arc
Ref.
S-0182
Figure
8-2.
Preparing Tungsten
For DC Electrode
Negative (DCEN) Welding
1
Tungsten
Electrode
2
Balled End
Ball end of
tungsten
before
welding
by applying
either
an ac
amperage
_______________________
1E:____
slightly higher
than what Is
recom
______________________
1 1/2
Times
mended
for
a
given
electrode di
Elect;ode Diameter
ameter
(see
Table
8-1),
or a
dc
electrode
positive
amperage.
2
Ref. S-0161
1
Tungsten
Electrode
2
2
Tapered
End
Grind end of
tungsten
on
fine
grit,
hard abrasive wheel before weld
ing.
Do
not
use
wheel for other
jobs
or
tungsten
can
become contami
nated
causing
lower weld
quality.
2-1/2 Times
Electrode Diameter
1
2
3
1
Arc Wander
2
Point
3
Grinding
Wheel
4
Radial Ground
4
Wrong Tungsten Preparation
Wandering
Arc
Ref.
S0162
OM-2204
Page
27