Fronius MTG 400i K4 Instructions De Service page 48

Malfunction of the torch trigger
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Porosity of weld seam
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48
Faulty plug connections between the welding torch and the power
source
Establish correct plug connections/send power source or welding
torch to service team
Soiling between torch trigger and torch trigger housing
Remove soiling
Faulty control line
Notify service provider
Spattering in the gas nozzle, causing inadequate gas shield for weld
seam
Remove welding spatter
Holes in gas hose or imprecise gas hose connection
Replace gas hose
O-ring at central connector is cut or faulty
Replace O-ring
Moisture/condensate in the gas line
Dry gas line
Gas flow too strong or weak
Correct gas flow
Inadequate quantity of gas at the start or end of welding
Increase gas pre-flow and gas post-flow
Rusted or poor quality wire electrode
Use high-quality wire electrode without soiling
Applies to gas-cooled welding torches: Gas leakage with non-isolated
inner liners
For gas-cooled welding torches, only use isolated inner liners
Too much parting agent applied
Remove excess parting agent/apply less parting agent
Extraction too strong
Reduce extraction