Lincoln Electric POWER FEED 25M Service Manual page 35

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B-17 OPERATION B-17
ALUMINUM GMAW-P AND GMAW-PP
ALUMINUM PULSE 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.12
Trim 1.50
Trim 1.00
Trim .50
Arc L ength Long
Arc Length Medium
Arc Length Short
POWER FEED® 25M