User Manual

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The Forney 140 MIG welder is designed for use on jobs involving maintenance and fabrication. It is
ideal for applications such as farming, automotive, and repairs. This transformer-based machine is
powered from standard 120V household current and produces 140 A output. The acceptable wire
diameters for use on this machine include .024” and .030”. The Forney 190 MIG and Forney 190 MP
are capable of accepting wire diameters up to .035”. The spool sizes compatible with this machine are
4” and 8” and should be loaded clockwise, so the wire feeds from the top into the wire feeing system.
This machine can weld materials up to ¼” thick.
Units may be used with the standard torch.
1. Main ON/OFF switch and welding voltage adjustment
2. Wire feed adjustment knob:
To increase the wire speed, turn the potentiometer clockwise; to decrease the wire speed, turn
it counter-clockwise. The same procedure decreases the values on the welding parameters. Turn
knob slowly.
3. Ground Clamp
4. MIG Torch/Gun
CAT# 309
120V MIG WIRE FEED WELDER
WELDING RANGE UP TO 140 AMPS
1
3
2
4
WARNING: If the duty cycle of the welder is exceeded, a thermostat will automatically cut
the power to prevent the machine from overheating. If this should happen do not unplug the
machine while it cools down. The thermostat will automatically reset itself and you can continue
welding. The thermostat is a protective safety device and no harm will normally be done to the
welder unless it is frequently over-loaded, in which case it may eventually become damaged.
Operation
Description
Welder Controls
Thermal Overload Protection