DESIGNER IM649 User guide

A-20 Appendix A
PULSE WAVE SHAPING PRINCIPLES
WAVE DESIGNER
8. For a second workpoint we went to 300 in/min. Select the 300 in/min. wire feed speed
from the pulldown menu in Waveform Editor window. Reset the PowerFeed for 300 in/min.
with a 1.00 trim.
9. Open the adapting stickout window and select
the ‘No Adapt’ mode; close the window.
10. At lower wire feed speed settings, some users
like to fix the values of the peak variables. To
do this, check the boxes next to the peak
variables (ramp up rate, ramp overshoot %,
peak amps, peak time, and tailout). Perform
weld trials and adjust the pulse wave shape
variables.
Pulse Waveform Editor
Wire Feed Speed
Ramp Up Rate
Peak Amps
Peak Time ms
Tailout Time
Tailout Speed
Stepoff Amps
Backgrd Amps
Backgrd Time
Ramp Overshoot %
8.3
20
25
.100
1.5
1.4
250
.0
600
Edit
150
27850045
Our Experiment: At the higher wire feed
speed, we needed more heat to melt the
added wire. We took the background up to
75 amps and the background time down to
3.8 milliseconds. (The frequency also
changed due to the change to the
background time.) Welding trials indicated
that the droplets were transferring properly
and that the arc length was correct for the
5/8 in. (16 mm) stickout.
11. Set the mode to ‘Adaptive’. Make a trial weld to check the peak voltage setting.
Our Experiment: While welding we found that 27 volts was about right for the peak voltage.
Since the peak variables did not change, the peak voltage will remain about the same as
well. We also noticed that the average voltage increased from the value observed at
150 in/min. This increase is due to the higher frequency required for the higher wire feed
speeds.