Lincoln Electric IM915 manual Steel and Stainless Synergic GMAW-P Pulsed MIG Welding, ARC Control

b-22 OPERATION b-22

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 Wave 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.7a

Trim .50	Trim 1.00	Trim 1.50
Arc Length Short	Arc Length Medium	Arc Length Long

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 increasing the background current, for a soft arc good for out-of-position welding.

FIGURE B.7b

Arc Control -10.0	Arc Control OFF	Arc Control +10.0
Low Frequency, Wide	Medium Frequency and Width	High Frequency, Focused

POWER FEED™ 10M SINGLE WIRE FEEDER