LOKERMANN GRAND TIG 250 DC PULSE, Руководство пользователя

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3.4.6
TIG Welding
trouble
shooting
The following chart addresses some of the common problems of TIG welding. In all cases of
equipment malfunction, the manufacturer’s recommendations should be strictly adhered to and
followed.
NO. Trouble Possible Reason Suggested Remedy
1
T ungsten burning
away quickly
Incorrect Gas or No Gas
Use pure Argon. Check cylinder
has gas, connected, turned on and
torch valve is open
Inadequate gas flow
Check the gas is connected, check
hoses, gas valve and torch are not
restricted.
Back cap not fitted correctly
Make sure the torch back cap is
fitted so that the o-ring is inside the
torch body
Torch connected to DC +
Connect the torch to the DC- output
terminal
Incorrect tungsten being
used
Check and change the tungsten type
if necessary
Tungsten being oxidised
after weld is finished
Keep shielding gas flowing 10–15
seconds after arc stoppage. 1
second for each 10amps of weld
current.
Tungsten melting back
into the nozzle on AC
welding
Check that correct type of tungsten
is being used. Check the balance
control is not set too high on the
balance-reduce to lower setting
2
Contaminated
tungsten
Touching tungsten into the
weld pool
Keep tungsten from contacting
weld puddle. Raise the torch so that
the tungsten is off of the work piece
2 - 5mm
Touching the filler wire to
the tungsten
Keep the filler wire from touching
the tungsten during welding, feed
the filler wire into the leading edge
of the weld pool in front of the
tungsten
Tungsten melting into the
weld pool
Check that correct type of tungsten
is being used. Too much current for
the tungsten size so reduce the amps
or change to a larger tungsten
3
Porosity - poor
weld appearance
and colour
Wrong gas / poor gas flow /
gas leak
Use pure argon. Gas is connected,
check hoses, gas valve and torch
are not restricted. Set the gas flow
between 6-12 l/min. Check hoses
and fittings for holes, leaks et
Contaminated base metal
Remove moisture and materials
like paint, grease, oil, and dirt from
base metal
Contaminated filler wire
Remove all grease, oil, or moisture
from filler metal
Incorrect filler wire
Check the filler wire and change if
necessary
4
Yellowish residue /
smoke on the
alumina nozzle &
discoloured
tungsten
Incorrect Gas Use pure Argon gas
Inadequate gas flow
Set the gas flow between 10 - 15
l/min flow rate
Inadequate post flow gas Increase the post flow gas time
Alumina gas nozzle too
small
Increase the size of the alumina gas
nozzle