Lincoln Electric IM859 POWER MIG 350MP - Manual (Page 26)

B-13 B-13 OPERATION
POWER MIG ® 350MP
POWER MODE™
The Power Mode™ process was developed by
Lincoln to maintain a stable and smooth arc at low
procedure settings which are needed to weld thin
metal without pop-outs or burning-through. For
Aluminum welding, it provides excellent control and
the ability to maintain constant arc length. This results
in improved welding performance in two primary types
of applications.
• Short Arc MIG at low procedure settings.
• Aluminum MIG welding.
Power Mode™ is a method of high speed regulation
of the output power whenever an arc is established. It
provides a fast response to changes in the arc. The
higher the Power Mode™ Setting, the longer the arc.
If a welding procedure is not established, the best way
to determine the Power Mode™ Setting is by experi-
mentation until the desired output result is estab-
lished.
In the Power Mode™ two variables need to be set:
• Wire Feed Speed
• Power Mode Trim
Setting up a Power Mode™ procedure is similar to
setting a CV MIG procedure. Select a shielding gas
appropriate for a short arc process.
• For steel, use 75/25 Ar/CO
2
shield gas.
• For Stainless, select a Helium blend Tri-Mix.
• For Aluminum, use 100% Ar.
Start by setting the wire feed speed based upon mate-
rial thickness and appropriate travel speed. Then
adjust the Volts/Trim knob as follows:
• For steel, listen for the traditional “frying egg”
sound of a good short-arc MIG procedure to know
you have the process set correctly.
• For aluminum, simply adjust the Volts/Trim knob
until the desired arc length is obtained.
Note the Volts/Trim display is simply a relative number
and DOES NOT correspond to voltage.
TIG WELDING:
The basic sequence of operation.
1. Use SET toggle to select GTAW (Mode 03)
2. Adjust desired amperage using WFS/AMPS CON-
TROL. If using an optional foot or hand Amptrol to
control current this setting will be maximum when
the Amptrol is fully depressed or extended.
3. Energize output with either a remote trigger device
plugged into the remote connector, or rotate
VOLTS/TRIM CONTROL clockwise.
4. Touch tungsten to work piece and lift off to establish the
arc.
5. START can be set by using the SELECT toggle. Use the
WFS/AMPS Control to set the respective start current.