Lincoln Electric IM649 Wave Designer - Manual (Page 70)

2. Pick a wire feed speed from the Wire Feed
Speed pulldown menu. We wanted to start
with a 130 in/min. WFS. But 130 is not a
workpoint in the selected wave shape
application. Use the Workpoint Editor window
to change the second workpoint (170 in/min.)
to 130.
3. Select 130 from the Wire Feed Speed
pulldown menu. Also, be sure to set the
PowerFeed’s wire feed speed to the same
WFS as the selected workpoint and set the
trim to 1.00. (In this exercise, the WFS is 130
in/min.) Set the PowerWave mode and Arc
Control settings to ‘OFF’.
4. If you are using the expanded STT Editor window, check the box next to the pinch/peak
variable. This will fix the ratio of pinch start to peak amps. Selecting the Simplify Editor
option (see the tools menu) automatically fixes this ratio.
NOTE: The STT process reacts to changes in the arc. When a short occurs, the STT routine
responds to the short in a controlled fashion. The STT process does not use an adaptive
loop. The process adapts to changes in stickout only by changes in the number of times
shorts occur.
5. While welding, adjust the STT variables to improve welding performance. Maintain a
constant 5/8 in. stickout (torch tip to work distance.)
STT WAVE SHAPING PRINCIPLES
WAVE DESIGNER
Our Experiment: The weld produced by this setting is too hot. We burned through the 16
gauge fillet. The arc is too long and is producing too much spatter.
First, we reduced the peak current to 250 amps. Welding again shows that the arc length is
now correct, but there is still too much heat in the arc.
Second, we reduced tailout from .100 to .140 (increasing tailout reduces the heat input). We
welded again and found there was still too much heat in the arc.
Next, we reduced the background to 35 amps. This resulted in very good fillet welds on 16
gauge steel.
The starting screen can be adjusted at this time if needed. The STT waveform incorporates
a soft start feature. The initial pulse to start the arc can be adjusted as necessary to achieve
excellent results on a wide variation of applications.
B-16 Appendix B
Our goal was to optimize the welding at only one workpoint. The 130 in/min. workpoint is fully
developed. If desired, you can save the new application, select the next workpoint and optimize
the welding at that wire feed speed in a similar fashion as the first. The Go Figure function can
assist in interpolating/extrapolating the variables at the next workpoint.
WorkPoint Editor
WorkPoint Editor
1
0
2
3
90
200
225
inch / min meter / min
Go Figure
28750067
130
STT Waveform Editor
Wire Feed Speed
Peak Amps
Edit
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350
200
90
225
200
130