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·
Very thick or wide welding
Can be caused by moving the torch too slowly.
·
Wire burns back
It can be caused by wire feed slipping, loose or damaged
welding tip, poor wire, nozzle held too close to work or
voltage too high.
·
Little penetration
It can be caused by moving torch too fast, too low voltage
setting or incorrect feed setting, reversed polarity, insufficient
blunting and distance between
operational
parameters
preparation of the workpieces.
·
Workpiece's piercing
It may be caused by moving the welding torch too slow, too
high welding power or by an invalid wire feeding.
·
Heavy spatter and porosity
It can be caused by nozzle too far from work, dirt on work or
by low gas flow. You have to the two parameters, remeber
that gas has not to be lower than 7-8 liters/ min. and that the
current of welding is appropriated to the wire you are using. It
is advisable to have a pressure reducer of input and output.
On the manometer you can read the range expressed in liter.
·
Welding arc instability
It may be caused by an insufficient welding voltage, irregular
wire feed, insufficient protective welding gas.
DESCRIPTION OF SIGNS AND SYMBOLS
U
... (V)
0
FAULT
Wire isn't conveyed when
Feed roll is turning
Wire feeding in jerk or
erratic way
No arc
Porous welding seams
The machine suddenly stops welding
operations after an extended and heavy
duty use
strips. Take care of
adjustment
and
improve
Single phase alternating
1 ~
voltage
Three
phase
3 ~
voltage
Nominal
open
voltage
1)
2)
3)
1)
2)
3)
4)
1)
2)
1)
2)
3)
4)
5)
1)
the
alternating
circuit
FAULT FINDING
REASON
Dirt in liner and/or contact tip
The frition brake in the hub
is too tightened
Faulty welding torch
Contact tip defect
Burns in contact tip
Dirt in feed roll groove
Feed roll's groove worn
Bad concat between earth clamp
and workpiece
Short-circuit between contact tip
and gas shroud
Failre of gas shield owing to
spatters in gas shro
Wrong welding torch distance
and/or inclination from workpiece
Too small gas flux
Humid workpieces
Heavily rusted workpieces
Welding machine overheated due
to an excessive use in stated duty
cycle
EN 60974-1
U
... (V/Hz)
1
I
... (A)
2
I
(A)
1 max
I
... (A)
1 eff
X
IP21
H
Blow with compressed air, replace contact
tip
Loosen
Check sheating of torchès
wire guide
Replace
Replace
Clean
Replace
Tighten earth clamp and check connections
Clean, replace tip and/or shroud as
necessary
Clean gas shroud from spatters
The length of stick out wire from tip must
be 5 – 10mm. Inclination not less than 60
degrees in relation to woekpiece
Increase flux of welding gas
Dry with heat producer
Clean workpieces from rust
Don't switch off the machine, let it cool
down for about 20/30 minutes
Transformer-rectifier
Norm of reference
Flat characteristic
MIG-MAG
wire
feed
welding
Nominal values of mains
voltage and frequency
Welding current
The
welding
unit's
maximum
absorbed
current
Effective current supplied
Duty cycle
The
welding
unit's
protection class
The
transformer's
insulation class.
Welding machine suitable
for use in environments
with heightened risk of
electric shock.
Symbols referring to safety
regulations
REMEDY
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