Troubleshooting - ESAB EMP 235ic Instruction Manual

8 TROUBLESHOOTING

8 TROUBLESHOOTING
Try these checks and inspections before sending for an authorised 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
MMA (SMAW) basic
welding problems
0463 641 001
Corrective action
• Check gas bottle is not empty.
• Check gas regulator is not closed.
• Check gas inlet hose for leaks or blockage.
• Check that the correct gas is connected and the correct
gas flow is used.
• Keep the distance between the MIG torch nozzle and the
work piece to a minimum.
• Do not work in areas where drafts, which would disburse
the shielding gas, are common.
• Make sure the work piece is clean, with no oil or grease on
the surface, 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 is set on the feed rollers.
• Make sure the proper direction of motion is set based on
the wire type (into the weld pool for aluminium, away from
the weld pool for steel).
• Make sure the correct contact tip is used and it is not
worn.
• Make sure liner is the right size and type for wire.
• Make sure the liner is not bent so that friction is caused
between the liner and the wire.
• Make sure the MIG torch is connected to the 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 torch angle is used.
• Make sure the work lead has proper contact with the work
piece.
• Make sure you are using the 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.
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