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OPERATION
B-7 B-7
POWER WAVE 655/R
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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. Using a preset voltage becomes impracti-
cal, and instead the arc length is set by adjusting "trim".
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.
Most pulse welding programs are syngeric. As the wire
feed speed is adjusted, the Power Wave will automati-
cally recalculate the waveform parameters to maintain
similar arc properties.
The Power Wave utilizes "adaptive control" to com-
pensate for changes in electrical stick-out while weld-
ing. (Electrical stick-out is the distance from the con-
tact tip to the work piece.) The Power Wave waveforms
are optimized for a 0.75" (19mm) stick-out. The adap-
tive behavior supports a range of stickouts from 0.50"
(13mm) to 1.25" (32mm). At very low or high wire feed
speeds, the adaptive range may be less due to reach-
ing physical limitations of the welding process.
Wave control in pulse programs usually adjusts the
focus or shape of the arc. Wave control values greater
than 0 increase the pulse frequency while decreasing
the background current, resulting in a tight, stiff arc
best for high speed sheet metal welding. Wave control
values less than 0 decrease the pulse frequency while
increasing the background current, for a soft arc good
for out-of-position welding. (See Figure B.3)
Time
Current
FIGURE B.3 - PULSE WAVE CONTROL CHARACTERISTICS