Lincoln Electric POWER FEED SVM185-A - Manual (Page 31)

OPERATION B-13 B-13
POWER FEED® 25M
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STEEL AND STAINLESS SYNERGIC GMAW-P (PULSED MIG) WELDING
Synergic GMAW-P (Pulsed MIG) welding is ideal for low spatter, out of position and reduced heat input applica-
tions. During pulse welding, the welding current continuously switches from a low level to a high level and then
back again. Each pulse sends a small droplet of molten metal from the wire to the weld puddle.
Pulse welding controls the arc length with 'Trim' instead of voltage. When trim (arc length) is adjusted, the POWER
FEED® automatically recalculates the voltage, current and time of each part of the pulse waveform for the best
result. Trim adjusts the arc length and ranges from 0.50 to 1.50, with a nominal value of 1.00 for a 3/4" (19mm)
electrode stick-out. Trim values greater than 1.00 increase the arc length, while values less than 1.00 decrease the
arc length.
FIGURE B.6
ARC CONTROL
For steel and stainless pulse modes, Arc Control regulates the focus or shape of the arc. Arc Control values greater
than 0.0 increase the pulse frequency while decreasing the background current, resulting in a tight, stiff arc best
for high speed sheet metal welding. Arc Control values less than 0.0 decrease the pulse frequency while increas-
ing the background current, for a soft arc good for out-of-position welding.
FIGURE B.7
Trim .50
Arc Length Short
Trim 1.00
Arc Length Mediu m
Trim 1.50
Arc L ength Long
A rc Con tr ol OFF
Med ium Fr equency and Wi dth
Arc Control +10.0
Hi gh Frequency , Fo cu sed
A rc Con tr ol -10.0
Low Frequency, Wi de