Instruction manual

WELDING GUIDE
GENERAL RULE
When welding on the lowest output settings, it is necessary to keep the arc as short as possible.
This should be achieved by holding welding torch as close as possible and at an angle of approximately 60 degrees to the
workpiece. The arc length can be increased when welding on the highest settings, an arc length up to 20 mm can be enough
when welding on maximum settings.
GENERAL WELDING TIPS
From time to time, some faults may be observed in the weld owing to external influences rather due to welding machinès faults.
Here are some that you may come across :
· Porosity
Small holes in the weld, caused by break-down in gas coverage of the weld or sometimes by foreign bodies inclusion. Remedy
is, usually, to grind out the weld.
Remember, check before the gas flux (about 8 liters/minutes), clean well the working place and finally incline the torch while
welding.
· Spatter
Small balls of molten metal which come out of the arc. A little quantity is unavoidable, but it should be kept down to a minimum
by selecting correct settings and having a correct gas flow and by keeping the welding torch clean.
· Narrow heap welding
Can be caused by moving the torch too fast or by an incorrect gas flow.
· 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.
· Poor 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 strips. Take care of operational parameters adjustment and improve the preparation of the workpieces.
· Workpiecès 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
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.
FAULT FINDING
FAULT REASON REMEDY
Wire isn’t conveyed when 1) Dirt in liner and/or contact tip Blow with compressed air,
feed roll is turning replace contact tip
2) The friction brake in the hub Loosen
is too tightened
3) Faulty welding torch Check sheating of torchès
wire guide
Wire feeding in jerk or 1) Contact tip defect Replace
erratic way 2) Burns in contact tip Replace
3) Dirt in feed roll groove Clean
4) Feed roll’s groove worn Replace
No arc 1) Bad contact between earth clamp Tighten earth clamp and
and workpiece check connections
2) Short-circuit between contact tip Clean, replace tip and/or
and gas shroud shroud as necessary
Porous welding seams 1) Failre of gas shield owing Clean gas shroud from
to spatters in gas shro spatters
2) Wrong welding torch distance The lenght of stick out wire
and/or inclination from workpiece from tip must be 5-10 mm.
Inclination not less than 60
degrees in relation to
workpiece
3) Too small gas flux Increase flux of welding
gas
4) Humid workpieces Dry with heat producer
5) Heavily rusted workpieces Clean workpieces from rust
The machine suddenly stops 1) Welding machine overheated Don’t switch off the machine,
weldig operations after an due to an excessive use in stated let it cool down for about
extended and heavy duty duty cycle 20/30 minutes
use
The machine is switch off even Fuse blowed on the service transformer Replace
it is
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UNI FLAME AUTOLIFT