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A7 MIG Gun 500-g© Kemppi Oy 2017 1712
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 o the power supply.
Cut o 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 Cause Solution
Gun neck gets hot Contact tip not tightened Check and tighten
Contact tip loose on the neck side. Check and tighten, and direct toward the work piece
No push-button function Control line interrupted or defective Check/repair
Wire burned solid in the contact tip Wrong parameters set Check or correct the setting(s)
Contact tip worn out Replace
Irregular wire feed Guide spiral liner / PA liner clogged Clean in both directions with compressed air, or replace the liner if
necessary
Contact tip and wire diameter not correctly matched Replace contact tip
Wrong contact pressure set at the wire feed unit Correct as specied by manufacturer
Arc between gas nozzle and work piece Spatter bridge between contact tip and gas nozzle Clean and spray gas nozzle interior
Unstable arc Contact tip not matched to the wire diameter, or increase in contact
tip diameter
Check contact tip
Wrong welding parameters set Correct welding parameters
Wire guide unit worn out Replace wire guide unit
Pore formation Strong spattering in the gas nozzle Clean gas nozzle
Insucient or missing gas cover Check gas cylinder contents and pressure setting
Air currents blow shielding gas away Shield welding area with partitions
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