Lincoln Electric IM761 POWER FEED 15M - Manual (Page 20)

B-6 OPERATION B-6
STT SYNERGIC WELDING
The Figures B.3 and B.3a is the waveshape of current
for the process. They are not drawn to scale, and are
intended only for the purpose of showing how the vari-
ables effect the waveform.
FIGURE B.3
Trim in the STT mode changes the heat input by
adjusting the tailout and background portion of the
waveform. For open root processes, the tailout is
fixed, and the trim affects only the background level.
Trim values greater than 1.0 add more energy to the
weld and make the weld puddle hotter; trim values
less than 1.0 reduce energy to the weld A nominal
value of 1.0 will work for most applications.
FIGURE B.3a
Arc control adjusts the arc length in the STT mode.
This is accomplished by changing the peak portion of
the current waveform. An arc control value of +10.0
maximizes the arc length by increasing the peak cur-
rent, while a arc control of -10.0 minimizes the arc
length by decreasing the peak current. The nominal
value is "OFF" (0.0), and should work for most appli-
cations.
POWER FEED 15M
Trim 1.00
Trim 1.50
Trim 0.50
Current
Time
Trim 1.50
Trim 1.00
Trim 0.50
HEAT
INPUT
C Arc ontrol 0.0
Arc Control +10.0
C Arc ontrol -10.0
Time
Current
ARC
LENGTH