22
Troubleshooting
No welding current
Mains switch is ON, indicators on the power source are lit up, shielding gas available
Cause:
Grounding (earthing) connection is incorrect
Remedy:
Check the grounding (earthing) connection and terminal for correct polarity
Cause:
Break in the current cable in the welding torch
Remedy:
Change the welding torch
No protective gas shield
All other functions are OK
Cause:
The gas cylinder is empty
Remedy:
Change the gas cylinder
Cause:
The gas pressure regulator is faulty
Remedy:
Replace the gas pressure regulator
Cause:
The gas hose is not connected, damaged or kinked
Remedy:
Connect/replace the gas hose, or straighten out kinks
Cause:
The welding torch is faulty
Remedy:
Replace welding torch
Cause:
Gas solenoid valve is faulty
Remedy:
Replace gas solenoid valve
Poor welding properties
Cause:
Incorrect welding parameters
Remedy:
Check the settings
Cause:
Poor grounding (earthing) connection
Remedy:
Ensure good contact to workpiece
Cause:
Inadequate protective gas shield, or none at all
Remedy:
Check the pressure regulator, gas hose, gas solenoid valve and torch gas connection. On gas-
cooled welding torches, inspect the gas seals, use a suitable inner liner.
Cause:
Welding torch is leaking
Remedy:
Replace welding torch
Cause:
Contact tube is too large or worn out
Remedy:
Replace contact tube
Cause:
Wrong wire alloy or wrong wire diameter
Remedy:
Check the wire spool that has been inserted
Cause:
Wrong wire alloy or wrong wire diameter
Remedy:
Check weldability of the base material
Cause:
The protective gas shield is not suitable for this wire alloy
Remedy:
Use the correct protective gas shield
Cause:
Unfavourable welding conditions: protective gas shield is contaminated (by moisture, air), inade-
quate gas shielding (weld pool „boiling“, draughts), contaminants in the workpiece (rust, paint,
grease)
Remedy:
Optimise the welding conditions
Cause:
Welding spatter in the gas nozzle
Remedy:
Remove the welding spatter
EN
Summary of Contents for Robacta MTG 3500
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Page 104: ...1 Spare parts list MTG 3500 5000 MTW 3500 5000...
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