Troubleshooting - ESAB EMP235ic Manuel D'instructions

8 TROUBLESHOOTING

8 TROUBLESHOOTING
Try these checks and inspections before sending for an authorized service technician.
Type of fault
Porosity within the weld
metal
Wire feeding problems
See appendix WEAR
PARTS for correct sizes
and types.
MIG (GMAW/FCAW)
welding problems
STICK (SMAW) basic
welding problems
TIG (GTAW) welding
problems
No arc
The overheating protection
trips frequently.
0463 479 001
Corrective action
• Check that the correct gas is connected and the correct
gas flow is used.
• Keep the distance between the MIG gun nozzle and the
work piece to a minimum.
• Make sure the work piece is clean before welding.
• Make sure the wire spool brake is adjusted correctly.
• Make sure the feed roller is correct size and not worn.
• Make sure the correct pressure on the feed rollers is set.
• Make sure the correct contact tip is used and it is not worn.
• Make sure the liner is not bent so that friction is caused
between the liner and the wire.
• Make sure the MIG gun is connected to correct polarity.
Refer to the electrode wire manufacturer for the correct
polarity.
• Replace contact tip if it has arc marks in the bore causing
excessive drag on the wire.
• Make sure the correct shielding gas, gas flow, voltage,
welding current, travel speed and MIG gun angle is used.
• Make sure the work lead has proper contact with the work
piece.
• Make sure you are using correct polarity. The electrode
holder is usually connected to the positive polarity and the
work lead to the negative polarity. If in doubt consult the
electrode data sheet.
• Make sure the TIG gun lead is connected to negative
welding terminal
• Make sure the correct shielding gas, gas flow, voltage,
welding current, travel speed, filler rod placement,
electrode diameter and welding mode on power source is
used.
• Make sure the work clamp has proper contact with the
workpiece.
• Make sure the gas valve on the TIG gun is on.
• Check that the electrical power supply switch is turned on.
• Check that the mains, welding, and return cables are
correctly connected.
• Check that the correct current value is set.
• Check the electrical power supply fuses.
• Make sure that you are not exceeding the recommended
duty cycle for the weld current you are using.
See section "Duty cycle" in the OPERATION chapter.
• Make sure the air inlets or outlets are not clogged.
- 38 - © ESAB AB 2017