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13.0
A certain experience is required to adjust and use a Mig power source. In Mig welding two parameters
are fundamental: the welding voltage and the wire speed. The resulting welding current is a result of these
two settings.
•
Set the voltage and wire feed controls to positions suitable for the thicknesses of the material to be welded.
•
Welding current varies in relationship to wire speed. For low welding current output, the wire speed
control knob should be set at the low end of the wire feed speed scale.
•
Turning the wire speed control knob clockwise, will result in increased wire feed speed and welding
current. Welding voltage must be adjusted to match the wire feed speed (welding current).
•
Progressively select higher voltage positions, while increasing the wire speed.
Increase of the welding voltage, at the same wire speed, leads to a longer arc (without substantially affecting
the current). Conversely, a decreased welding voltage results in a shorter arc (the current again is not su-
bstancially changed).
A change in wire diameter results in changed parameters. A smaller diameter wire requires an increase
in wire feed speed to reach the same current. But be careful: If certain limits are exceeded, a satisfactory
weld cannot be obtained:
•
A) A too high wire feed speed (too high with regard to the welding voltage) results in pulsing within
the torch. This is because the wire dips into the puddle and cannot be melted off fast enough. This
will cause excessive spatter,
•
B) A too high welding voltage (too high with regard to the wire feed speed), will result in excessive
and unstable arc. By increasing still further the voltage, the contact tip will burn.
•
C) In any case, an excessive wire speed can be corrected through the arc voltage increase. The li-
mit of this operation depends on the thickness of the material to weld (a certain limit exceeded will
result in the perforation).Place the torch over the seam to be welded holding it at approximately
a 45° angle, with the nozzle at 5 mm distance from the piece to be welded. Lower the shielding
helmet and press the welding torch trigger to initiate an arc. As the arc has struck, move the torch
from a left to right direction, slowly along the seam at a constant speed.
•
Using the wire speed control knob, adjust for a "crisp" sounding arc: experience will help to reco-
gnize the right "sound" of the arc.
14.0
TECHNICAL DATA INfORMATION gUIDE
36
-ENGLISH-
OPERATION
1 Serial Number of the unit
2 Power source model
3 Type of characteristic
4 Min. - Max rated No Load Voltage
5 Type of welding
6 Symbol for the main supply and no. of phases
7 Rated value of the supply voltage
8 Code letter for degree of insulation
9 Protection degree
10 Power
11 Size of the necessary main fuse
12 Supply current
13 Welding supply and voltage
14 Power Factor
15 Control range (current / voltage)
FIG. 21
16 Reference standard
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