DESCRIPTION OF SIGNS AND SYMBOLS
1 ~
Single phase alternating voltage
3 ~
Three phase alternating voltage
U
0
… (V)
Nominal open circuit voltage
Transformer-rectifier
EN 60974-1
Norm of reference
Flat characteristic
MIG-MAG wire feed welding
U
1
… (V/Hz)
Nominal values of mains voltage
and frequency
I
2
… (A)
Welding current
I
1 max
(A)
The welding unit's maximum
absorbed current
I
1 eff
… (A)
Effective current supplied
X
Duty cycle
IP21
The welding unit's protection
class
H
The transformer's insulation
class.
Welding machine suitable for use
in environments with heightened
risk of electric shock.
Symbols referring to safety
regulations
FAULT FINDING
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
REASON
1) Dirt in liner and/or contact tip
2) The frition brake in the hub
is too tightened
3) Faulty welding torch
1) Contact
tip
defect
2) Burns in contact tip
3) Dirt in feed roll groove
4) Feed roll’s groove worn
1) Bad concat between earth clamp
and workpiece
2) Short-circuit between contact tip
and gas shroud
1) Failre of gas shield owing to
spatters in gas shro
2) Wrong welding torch distance
and/or inclination from workpiece
3) Too small gas flux
4) Humid
workpieces
5) Heavily
rusted
workpieces
1) Welding machine overheated due
to an excessive use in stated duty
cycle
REMEDY
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
