Troubleshooting - Kemppi A7 MIG Gun 500-g Operating Manual

13. TROUBLESHOOTING

Risk of injury due to unexpected start-up
For the entire duration of maintenance, servicing, unmounting, and repair work, the
following instructions must be adhered to:
• Switch off the power supply.
• Cut off the compressed air supply.
• Pull the power plug.
In the event of any doubts or problems, please contact your retailer or the
manufacturer.
Please also consult the operating instructions for the other welding components,
such as the power supply and air pressure line.
Problem
Gun neck gets hot
No push-button function
Wire burned solid in the contact tip
Irregular wire feed
Arc between gas nozzle and work piece
Unstable arc
Pore formation
Cause
Contact tip not tightened
Contact tip loose on the neck side.
Control line interrupted or defective
Wrong parameters set
Contact tip worn out
Guide spiral liner / PA liner clogged
Contact tip and wire diameter not correctly matched
Wrong contact pressure set at the wire feed unit
Spatter bridge between contact tip and gas nozzle
Contact tip not matched to the wire diameter, or increase in contact
tip diameter
Wrong welding parameters set
Wire guide unit worn out
Strong spattering in the gas nozzle
Insufficient or missing gas cover
Air currents blow shielding gas away
© Kemppi Oy 2016
Solution
Check and tighten
Check and tighten, and direct toward the work piece
Check/repair
Check or correct the setting(s)
Replace
Clean in both directions with compressed air, or replace the liner if
necessary
Replace contact tip
Correct as specified by manufacturer
Clean and spray gas nozzle interior
Check contact tip
Correct welding parameters
Replace wire guide unit
Clean gas nozzle
Check gas cylinder contents and pressure setting
Shield welding area with partitions
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A7 MIG Gun 500-g 1616