Forney Easy Weld 140 MP Manual De Instrucciones página 24

PROBLEM
Low output or non-penetrating
weld.
Feed motor operates but wire
will not feed.
Wire is "bird-nesting" at the
drive roller or jamming.
Wire burns back to contact tip.
Ground clamp, ground cable,
and/or welding cable get hot.
Gun nozzle arcs to work
surface.
24
POSSIBLE CAUSE
Weld parameters too low.
Too long or improper extension cord.
Wrong type or size wire.
Poor ground connection or gun
connection.
Wrong size or worn contact tip.
Input power too low.
Stick-out too long.
Insufficient feed drive roller pressure.
Burr on end of wire.
Liner blocked or damaged.
Too much pressure on drive roller.
Contact tip is clogged or damaged.
Wire feed speed is set too low for voltage
setting being used.
Stick-out too short.
Wrong size contact tip.
Contact tip is clogged or damaged.
Bad ground or loose ground connection.
Slag build-up inside nozzle or nozzle is
clogged.
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POSSIBLE SOLUTION
Adjust welding parameters
Use a proper extension cord (#12 AWG
wire or heavier, no longer than 25 ft.). See
"Extension Cords", page 11.
Use 0.023" (0.6mm) - 0.030" (0.8mm)
wire. See "Welding Wire Selection"
(page 18). Use ER70S-6 or E71T-GS self-
shielding flux-core wire.
Reposition clamp and check cable to
clamp connection.
Check connection of ground cable, gun,
and MIG ELECTRODE POLARITY JUMPER
(9).
Use 0.023-inch (0.6mm) or 0.030-
inch (0.8mm) contact tip with the
corresponding wire. Replace contact tip if
worn.
Have a qualified electrician verify the
voltage at your outlet. If the voltage is
appropriate, verify that the circuit wiring is
sufficient for 20A.
Decrease stick-out (the amount the wire
extends past the contact tip).
Replace wire feeding motor.
Re-cut wire so it is square with no burr.
Clear with compressed air or replace liner.
Adjust the drive pressure. See "Installing
The Welding Wire", page 14.
Replace contact tip.
Increase wire feed speed (turn RIGHT
KNOB (5) clockwise).
Increase stick-out (the amount the wire
extends past the contact tip).
Use correct size contact tip.
Replace contact tip.
Check the connection of the ground clamp
and gun to the machine.
Check the connection of the MIG
ELECTRODE POLARITY JUMPER (9).
Check connection of the ground cable
to the ground clamp. Tighten cable
connection to ground clamp if needed.
Ensure the connection between the ground
clamp and workpiece is good and on
clean, bare (not painted or rusted) metal.
Clean or replace nozzle as needed.