Selco Neomig 3500 Instrucciones De Uso página 30

Cause Incorrect or worn rolls.
Solution Replace the rolls.
Cause Faulty wire feeder.
Solution Replace the faulty component.
Contact the nearest service centre to have the sys-
tem repaired.
Cause Damaged torch liner.
Solution Replace the faulty component.
Contact the nearest service centre to have the sys-
tem repaired.
Cause Incorrect spindle clutch or rolls locking tightening
pressure.
Solution Release the clutch.
Increase the rolls locking pressure.
Arc instability
Cause Insufficient gas protection.
Solution Adjust the gas flow.
Check that the diffuser and the gas nozzle of the
torch are in good conditions.
Cause Incorrect welding parameters.
Solution Check the welding system carefully.
Contact the nearest service centre to have the sys-
tem repaired.
Excessive spatter
Cause Incorrect arc length.
Solution Decrease the distance between the electrode and
the piece.
Decrease the welding voltage.
Cause Incorrect welding parameters.
Solution Decrease the welding voltage.
Cause Incorrect arc regulation
Solution Increase the equivalent circuit inductive value setting.
Connect to the appropriate choke output stud.
Cause Insufficient gas protection.
Solution Adjust the gas flow.
Check that the diffuser and the gas nozzle of the
torch are in good conditions.
Cause Incorrect welding mode.
Solution Decrease the torch angle.
Insufficient penetration
Cause Incorrect welding mode.
Solution Decrease the welding travel speed.
Cause Incorrect welding parameters.
Solution Increase the welding current.
Cause Incorrect preparation of the workpieces.
Solution Increase the chamfering.
Cause Incorrect ground connection.
Solution Ground the system correctly
Read the paragraph "Installation ".
Cause Pieces to be welded too big.
Solution Increase the welding current.
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Cause Insufficient air pressure.
Solution Adjust the gas flow.
Read the paragraph "Installation".
Undercut
Cause Incorrect welding parameters.
Solution Decrease the welding voltage.
Use a smaller diameter electrode.
Cause Incorrect arc length.
Solution Increase the distance between the electrode and
the piece.
Increase the welding voltage.
Cause Incorrect welding mode.
Solution Decrease the side oscillation speed while filling.
Decrease the travel speed while welding.
Cause Insufficient gas protection.
Solution Use gases suitable to the materials to be welded.
Porosity
Cause Grease, varnish, rust or dirt on the workpieces to
be welded.
Solution Clean the workpieces accurately before welding.
Cause Grease, varnish, rust or dirt on the filler material.
Solution Always use quality materials and products.
Keep the filler material always in perfect conditions.
Cause Humidity in the filler material.
Solution Always use quality materials and products.
Keep the filler material always in perfect condi-
tions.
Cause Incorrect arc length.
Solution Increase the distance between the electrode and
the piece.
Increase the welding voltage.
Cause Humidity in the welding gas.
Solution Always use quality materials and products.
Ensure the gas supply system is always in perfect
conditions.
Cause Insufficient gas protection.
Solution Adjust the gas flow.
Check that the diffuser and the gas nozzle of the
torch are in good conditions.
Cause The weld pool solidifies too quickly.
Solution Decrease the travel speed while welding.
Pre-heat the workpieces to be welded.
Increase the welding current.
Hot cracks
Cause Incorrect welding parameters.
Solution Decrease the welding voltage.
Use a smaller diameter electrode.
Cause Grease, varnish, rust or dirt on the workpieces to
be welded.
Solution Clean the workpieces accurately before welding.