Lincoln Electric POWER FEED SVM185-A - Manual (Page 39)

OPERATION B-21 B-21
POWER FEED® 25M
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GMAW-STT™
Waveform Control Technology™ maximizes the
ability to modify the arc for the perfect weld. When
STT™ welding, the parameters to control are:
• Wire Feed Speed - sets the deposition rate.
• Peak Current - controls the arc length.
• Background Current - regulates the bead contour.
• Tail-out - provides additional power in the arc.
There is no Voltage control when STT™ welding.
220 ----
WFS AMPS VOLTS TRIM
Less
Deposition
More
Deposition
EFFECT / RANGE
PEAK CURRENT
B A C K G R O U N D
CURRENT
TAIL OUT
( STT ll MODES
ONLY)
DESCRIPTION
Peak Current acts similar to an arc pinch
control. Peak Current sets the arc length
and promotes
-
g o o d f u s i o n . H i g h e r peak
current levels will cause the arc to broaden
momentarily while increasing arc length. I f
set too high, globular transfer may occur.
Setting it too low may cause instability
and wire stubbing. Best practice is to
adjust for minimum spatter and puddle
agitation.
Background Current controls the overall
heat input in the weld.
Tail out provides additional p o w e r
w i t h o u t t h e m o l t e n droplet becoming
too large. Increase as necessary to add
heat input without increasing arc length.
Often this results in faster travel speeds.
Note that as tail out increases, the peak
current
to be reduced.
and/or background current may need
PREFLOW TIME
0 - 10 seconds
RUN-IN WFS:
Off, 50 to150 in/min.
Start Procedure
FUNCTION
Adjusts the time that shielding
gas flows after the trigger is
pulled and prior to feeding wire.
R u n - i n s e t s t h e w i r e f e e d
speed from the time the trigger
is pulled until an arc is estab-
lished.
The Start Procedure is not
commonly used with STT
procedures.
PARAMETER
RANGE
Postflow Time:
0 to 10 seconds
FUNCTION
Adjusts the time that shielding
gas flows after the welding out-
put turns off.
ELECTRODE AND GAS
STEEL CO
2
STAINLESS
Ar/CO
2
He/Ar/CO
2
STEEL CO
2
STAINLESS
Ar/CO
2
He/Ar/CO
2
WIRE SIZE
0.035 0.045 0.052
110 126 126
110 126 126
WELD MODES
START OPTIONS
END OPTIONS
ARC CONTROL
Steel
.035"
SET
SETUP
IR PORT
STT
WAVEFORM CONTROL TECHNOLOGY
WELD MODE
ARC CONTROL
109
START OPTIONS
END OPTIONS
STEEL CO
STEEL CO
STEEL AR/CO
STAINLESS He/Ar/CO
STAINLESS He/Ar/CO
STAINLESS Ar/CO
2
2
2
2
2
2
(with Hot Start)
(SYNERGIC STT)
SYNERGIC STT, OPEN ROOT
123 124 124
123 124 124
111 117 120
112 118 121
113 119 122
135 137 ---
127 129 ---
131 133 ---
Burnback: 0 to .25
Seconds
T h e b u r n b a c k t i m e i s t h e
amount of time that the weld
output continues after the wire
stops feeding. It prevents the
wire from sticking in the puddle
and prepares the end of the
wire for the next arc start.
Crater Procedur e Crater is not commonly used
in STT weld procedures.
MSP4 OPERATION