Lincoln Electric IM649 Wave Designer - Manual (Page 40)

2. Open the Adaptive Loop / Find the Optimal Arc Characteristics
Use the following weld trials and adjustment sequence to tune the selected waveform for your
weld application at the designated workpoint (wire feed speed). Weld trials and adjustments are
more easily performed with one person welding while you adjust the waveform parameters at the
computer terminal.
a. Click on the button to open the Adapting
Stickout screen. Select the No Adapt option to open
the adaptive loop of the welding machine. The
adaptive indicator on the editor screen will change to
No Adapt, indicating that the welding machine is in an
open-loop, non-adaptive, condition.
NOTE: The adaptive loop must be open to prevent the
welding machine from making adaptive responses
to the wave shape changes. If the adaptive loop is
closed, observations of how the welding machine
responds to the wave shape changes will be false.
Failure to open the adaptive loop of the welding
machine will inhibit the development of a
successful waveform for your welding application.
b. Set the PowerFeed Trim control for a readout of 1.00. This will ensure that the wave shape
is designed at the midrange of the trim adjustment capability. The welding machine’s trim
control allows the welder to adjust the arc length between 0.5 to 1.5 (50% to 150%) times
the established arc length adjustment factor.
c. Maintain a constant stickout. The stickout should be equal to the expected average of the
welding application. We recommend about 5/8 in. to 3/4 in. (16 mm to 19 mm) electrical
stickout.
d. While welding a trial weld bead, adjust the pulse variables (peak current, peak time,
background current, frequency, etc.) to achieve a desired droplet transfer with a fixed 5/8 in.
to 3/4 in. (16 mm to 19 mm) stickout at the selected wire feed speed. Refer to paragraph
A.5.
e. With the stickout at a fixed setting, make trail welds during each adjustment so you can
directly observe the effect of the adjustments in the arc and resulting weld. Adjust the
variables as needed to achieve the desired weld transfer at the fixed stickout.
A-8 Appendix A PULSE WAVE SHAPING PRINCIPLES
WAVE DESIGNER
Adapting Stickout
Adapting Stickout
For Wire Feed Speed
No Adapt: Maintain constant wire extension
27850033
Adaptive: Maintain constant arc length
Adaptive Type
Peak Voltage
Inductance
30.0
2.625
Fresa
150
PeakAmp 10%, Stepoff 30%, Background 30%, Freq 45%
27850034
RAMP-UP RATE
TAILOUT
SPEED
TAILOUT
TIME
STEP-OFF
AMPS
BACKGROUND
TIME
BACKGROUND AMPS
1/FREQUENCY
% OVERSHOOT
PEAK TIME
PEAK
AMPS