Yeswelder YWM-160, User Manual, Page: 23 / 28

TROUBLESHOOTING
MIG WELDING ISSUES
PROBLEM
Arc works but not
feeding wire
Wire is "bird
nesting" at the drive
roller or jamming
Low Output or non
penetrating weld.
Work clamp, ground
cable,
and/or weld-
ing cable get hot.
Gun nozzle arcs to
work surface
Wire burns back to
contact tip.
POSSIBLE CAUSE
No pressure on the drive roller;
insufficient or excessive pressure on the
drive roller.
Wire spool is empty
Too much pressure on drive roller.
The contact tip is clogged or damaged
The contact tip size is too small.
Worn guides or drive roll alignment.
The welding current is too low.
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
Bad ground or loose ground connection.
Spatter or Slag build-up inside nozzle or
nozzle is clogged
Wire feed speed is set too low for volt-
age setting being used
Stick-out too short
Wrong size contact tip
Contact tip is clogged or damaged
Burn back time setting is too long
• 20
COURSE OF ACTION
Adjust the drive pressure.
Check if wire is in place and replace if necessary
Adjust the drive pressure
Replace contact tip
Replace parts
Adjust welding parameters
Use 030" (0 8mm) - 035" (0 9mm) wire
Reposition clamp and check cable to clamp connection
Check connection of ground cable, gun, and Wire Polarity
Drive Lead
Use .030" (0.8mm) or .035" (0.9mm) contact tip with the cor-
responding 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 the circuit breaker size
Decrease stick Out (the amount the wire extends past the
contact tip)
Check the connection of the work clamp and gun to the ma
chine. Check the connection Of the MIG Gun. Check con
nection of the ground cable to the work clamp. Tighten ca
ble connection to work clamp if needed. Ensure the contact
between the work clamp and workpiece
is good and on a
clean, bare metal surface. Make sure the cable is not dam
aged
Clean or replace nozzle as needed.
Increase wire feed speed (turn left knob clockwise)
Increase stick-out (the amount the wire extends past the
contact tip)
Use correct size contact tip
Replace contact tip
Reduce the burn back time setting.