GUN
www.sifbronze.co.uk
7
7. Troubleshooting
Symptom
Possible causes
No arc
• Power to work piece or swan neck interrupted.
• Defect power source or control unit.
• Control signal is interrupted (cable).
• Switch protection in the power source is not activated.
Arcing to the work piece
• Nozzle is contaminated.
Poor or no smoke extraction
• Extraction unit is not switched on.
• Extraction flow is less than 55m3/h.
• Filter of the extraction unit is contaminated.
• Torch is externally damaged.
Swan neck overheats
• Insufficient cooling water flow.
• Cooling water lines are blocked.
• Duty cycle exceeds the value allowed for the torch.
• Contact tip or tip adapter not properly fastened.
• Torch is externally damaged.
Welding wire fuses with the
contact tip
• Welding wire transport starts to late.
• Welding wire is jammed inside the cable package due to con-
tamination or bending.
• Welding wire speed is too low.
• Distance between the contact tip and the work piece is too big.
• Contact tip overheats.
Contact tip overheats
• Insufficient cooling water flow.
• Cooling water lines are blocked.
• Duty cycle exceeds the value allowed for the torch.
• Contact tip or tip adapter not properly fastened.
• Torch is externally damaged.
Irregular welding wire feed
• Pressure of the welding wire supply rolls is too low.
• Defect in the welding wire feed hose.
• Wrong liner is installed.
• Defect control unit.
• Excessive wear of the welding wire supply rolls.
• Wrong welding wire supply rolls installed.
Porosity
• Nozzle opening or contact tip is contaminated.
• Insufficient gas shielding (gas flow).
• Air flow disturbs the gas shielding.
• Liner nut not tightened correctly.
• Wrong liner is installed.
