Forney 270 MIG Manual De Instrucciones página 22

PROBLEM
Lack of penetration.
Wire is birdnesting at the
drive roller.
Wire burns back to
contact tip.
Workpiece clamp and/or
cable gets hot.
Gun nozzle arcs to work
surface.
Wire pushes torch back
from the workpiece.
22
POSSIBLE CAUSE
Voltage or wire feed speed too low.
Loose connection inside the
machine (rare).
Worn or wrong size contact tip.
Loose gun connection or faulty gun
assembly.
Wrong size wire.
Torch moved too fast.
Eccessive pressure on drive roller.
Gun liner worn or damaged.
Contact tip clogged or damaged.
Liner stretched or too long.
Contact tip clogged or damaged.
Wire feed speed too slow.
Wrong size contact tip.
Bad connection from cable to
clamp.
Slag buildup inside nozzle or
nozzle is shorted.
Wire feed speed too fast.
Nozzle clogged.
Torch held too far from the
workpiece.
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POSSIBLE SOLUTION
Re-adjust the welding parameters.
Clear with compressed air and
tighten all connections.
Replace the contact tip.
Tighten or replace torch.
Use correct size welding wire.
Move the gun smoothly and not too
fast.
Adjust pressure on drive roller.
Replace wire liner.
Replace contact tip.
Cut wire liner at the right length.
Replace the contact tip.
Increase wire speed.
Use correct size contact tip.
Tighten clamp connection or
replace cable.
Clean or replace nozzle.
Decrease wire feed speed.
Clean or replace nozzle
Hold the torch at the right distance.