Gmaw-Stt Welding - Lincoln Electric POWER FEED 25M Operator's Manual

®
POWER FEED 25M & 25M ALUMINUM
GMAW-STT
®
Waveform Control Technology
modify the arc for the perfect weld. When STT
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.
109
WELD MODE
ARC CONTROL
ULTIMARC*
EFFECT / RANGE
PEAK CURRENT 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
B A C K G R O U N D
heat input in the weld.
CURRENT
Tail out provides additional power
TAIL OUT
without the molten droplet becoming
( STT
ll MODES
too large. Increase as necessary to add
ONLY)
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.
*Wave Control in Power Wave 355 and 455 machines.
® maximizes the ability to
® welding, the
USER INTERFACE Operation, GMAW-STT
STEEL
.035"
STT
SET
DESCRIPTION
and/or background current may need
®
220
WFS
AMPS
® Welding
START OPTIONS
EFFECT / RANGE
Preflow Time
Run-In WFS:
Start Procedure
SETUP
START OPTIONS
END OPTIONS
EFFECT / RANGE
Crater Procedure
Burnback:
Postflow Time:
B-17
OPERATION
----
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.
END OPTIONS
FUNCTION
Crater is not commonly used
in STT weld procedures.
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.
Adjusts the time that shielding
gas flows after the welding out-
put turns off.
VOLTS
TRIM