Forney 220 MP - Page 25

25
WWW.FORNEYIND.COM
PROBLEM
POSSIBLE CAUSE POSSIBLE SOLUTION
Low output or non-penetrating
weld.
Weld parameters too low. Adjust welding parameters
Too long or improper extension cord. Use a proper extension cord (#12 AWG
wire or heavier, no longer than 25 ft.). See
“Extension Cords”, page 11.
Wrong type or size wire. Use 0.023” (0.6mm) - 0.035” (0.9mm)
wire. See “Welding Wire Selection” (page
18).
Poor ground connection or gun
connection.
Reposition clamp and check cable to
clamp connection.
Check connection of ground cable, gun,
and MIG ELECTRODE POLARITY JUMPER.
Wrong size or worn contact tip. Use 0.023-inch (0.6mm) or 0.035-
inch (0.9mm) contact tip with the
corresponding wire. Replace contact tip if
worn.
Input power too low. Have a qualified electrician verify the
voltage at your outlet. If the voltage is
appropriate, verify that the circuit wiring is
sufficient for the circuit breaker size.
Stick-out too long. Decrease stick-out (the amount the wire
extends past the contact tip).
Ground clamp, ground cable,
and/or welding cable get hot.
Bad ground or loose ground connection. Check the connection of the ground clamp
and gun to the machine.
Check the connection of the MIG
ELECTRODE POLARITY JUMPER.
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.
Make sure cable is not damaged.
Gun nozzle arcs to work
surface.
Slag build-up inside nozzle or nozzle is
clogged.
Clean or replace nozzle as needed.
Feed motor operates but wire
will not feed.
Insufficient feed drive roller pressure. Adjust drive roller pressure.
Burr on end of wire. Re-cut wire so it is square with no burr.
Liner blocked or damaged. Clear with compressed air or replace liner.
Despooler tension too high. Adjust despoiler tension.
Wire is “bird-nesting” at the
drive roller or jamming.
Too much pressure on drive roller. Adjust the drive pressure. See “Installing
The Welding Wire”, page 14.
Contact tip is clogged or damaged. Replace contact tip.
Worn guides or drive roll alignment. Replace parts.