Lincoln Electric IM10077 POWER FEED 25M - Manual (Page 35)

B-19 OPERATION B-19
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.
POWER FEED™ 25M
WFS
AMPS
VOLTS
TRIM
220 ----
EFFECT / RANGE
EFFECT / RANGE
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 good fusion. Higher 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 power
without the molten 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
Run-In WFS:
Start Procedure
FUNCTION
Adjusts the time that shielding
gas flows after the trigger is
pulled and prior to feeding wire.
Run-in sets the wire feed
speed from the time the trigger
is pulled until an arc is estab-
lished or 2.5 seconds.
The Start Procedure is not
commonly used with STT
procedures.
FUNCTION
START OPTIONS
END OPTIONS
ULTIMARC*
Crater Procedure Crater is not commonly used
in STT weld procedures.
STEEL
.035”
STT
109
START OPTIONS
END OPTIONS
SET
SETUP
WELD MODE
ARC CONTROL
*Wave Control in Power Wave 355 and 455 machines. ®
Postflow Time: Adjusts the time that shielding
gas flows after the welding out-
put turns off.
Burnback: The burnback time is the
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.
USER INTERFACE Operation, GMAW-STT™ Welding