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.1
7
)
FIGURE B.1
7
Most pulse welding programs are synergic. As the wire feed
speed is adjusted, the Vantage
®
441X
/LE500X
will automatically
recalculate the waveform parameters to maintain similar arc
properties.
The Vantage
®
441X
/LE500X
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 Vantage
®
441X
/LE500X
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
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.1
8
)
Trim .50
Arc Length Short
Trim 1.00
Arc Length Medium
Trim 1.50
Arc Length Long
B-13
OPERATION
OFF
Medium Frequency and Width
+10.0
High Frequency, Focused
UltimArc™ Control -10.0
Low Frequency, Wide
UltimArc™ Control
UltimArc™ Control
FIGURE B.1
8
VANTAGE
®
441X
/LE500X