MIG WELDING TROUBLESHOOTING (cont.)
Other weld problems can be reduced by checking the following points.
AAW)
Troubleshooting - MIG Weld Quality
Fault
Cause
Remedy
Undercut.
Welding arc voltage too high.
Decrease voltage or increase the wire feed speed.
Incorrect torch angle.
Adjust angle.
Excessive heat input.
Increase the torch travel speed and/or decrease welding current by
decreasing the voltage or decreasing the wire feed speed.
Lack of penetration.
Welding current too low.
Increase welding current by increasing wire feed speed and increasing
voltage.
Joint preparation too narrow or gap too
tight.
Increase joint angle or gap.
Shielding gas incorrect.
Change to a gas which gives higher penetration.
Lack of fusion.
Voltage too low.
Increase voltage.
Excessive spatter.
Voltage too high.
Decrease voltage or increase the Current (Wire Speed) control.
Voltage too low.
Increase the voltage or decrease Current (Wire Speed).
Irregular weld shape.
Incorrect voltage and current settings.
Convex, voltage too low. Concave, voltage
too high.
Adjust voltage and current by adjusting the voltage control and the
Current (Wire Speed) control.
Wire is wandering.
Replace contact tip.
Incorrect shielding gas.
Check shielding gas.
Insufficient or excessive
heat input.
Adjust the Current (Wire Speed) control or the voltage control.
Weld cracking.
Weld bead is too small.
Decrease travel speed.
Weld penetration narrow and deep.
Reduce current and voltage and increase MIG torch travel speed or
select a lower penetration shielding gas.
Excessive weld stresses.
Increase weld metal strength or revise design.
Excessive voltage.
Decrease voltage.
Cooling rate too fast.
Slow the cooling rate by preheating part to be welded or cool slowly.
Cold weld puddle.
Loose welding cable connection.
Check all welding cable connections.
Low power supply voltage.
Contact supply authority.
Arc does not have a crisp sound that short
arc exhibits when the wire feed speed and
voltage are adjusted correctly.
The MIG torch has been connected to the
wrong voltage polarity on the front panel.
Connect the MIG torch to the positive (+) welding terminal for solid wires
and gas shielded flux cored wires. Refer to the electrode wire manufac-
turer for the correct polarity.
ZZZVWUDWDFRQ]
