Pulse Welding - Lincoln Electric Vantage 549X Manual

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VANTAGE 549X

PULSE WELDING

Pulse welding procedures are set by controlling an overall "arc
length" variable. When pulse welding, the arc voltage is highly
dependent upon the waveform. The peak current, back ground
current, rise time, fall time and pulse frequency all affect the voltage.
The exact voltage for a given wire feed speed can only be predicted
when all the pulsing waveform parameters are known. Voltage or
Trim can be adjusted.
Trim adjusts the arc length and ranges from 0.50 to 1.50 with a
nominal value of 1.00. Trim values greater than 1.00 increase the
arc length, while values less than 1.00 decrease the arc length.
1.00 is a good starting point for most conditions. (See Figure B.15)
FIGURE B.15
Trim 1.00
Trim .50
Arc Length Medium
Arc Length Short
Most pulse welding programs are synergic. As the wire feed
speed is adjusted, the Vantage
recalculate the waveform parameters to maintain similar arc
properties.
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The Vantage 549X utilizes "adaptive control" to compensate for
changes in the electrical stick-out while welding. (Electrical stick-
out is the distance from the contact tip to the work piece.) The
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Vantage 549X waveforms are optimized for a 0.75" stick-out.
The adaptive behavior supports a range of stick-outs from 0.50 to
1.25". At very low or high wire feed speeds, the adaptive range
may be less due to reaching physical limitations of the welding
process.
UltimArc™ Control -10.0
Low Frequency, Wi de
Trim 1.50
Arc L ength Long
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549X will automatically
UltimArc™ Control
Med ium Fr equency and Wi dth
UltimArc™ Control
UltimArc™ Control adjusts the focus or shape of the arc.
UltimArc™ Control is adjustable from -10.0 to +10.0 with a
nominal setting of 0.0. Increasing the UltimArc™ Control
increases the pulse frequency and background current while
decreasing the peak current. This results in a tight, stiff arc used
for high speed sheet metal welding. Decreasing the UltimArc™
Control decreases the pulse frequency and background current
while increasing the peak current. This results in a soft arc good
for out of position welding. (See Figure B.16)
FIGURE B.16
UltimArc™ Control
OFF
B-13
+10.0
Hi gh Frequency , Fo cu sed
OPERATION