Fronius MTG 250i Instrucciones De Operación página 53

Torch trigger malfunction
Cause: Defective plug connection between welding torch and power source
Remedy: Establish proper plug connections / have power source or welding
torch serviced
Cause: Build up of dirt between torch trigger and torch trigger housing
Remedy: Clean away the dirt
Cause: Control line is faulty
Remedy: Contact After-Sales Service
Weld seam porosity
Cause: Spatter build-up in the gas nozzle causing inadequate gas shield for
weld seam
Remedy: Remove welding spatter
Cause: Holes in gas hose or hose is not connected properly
Remedy: Replace gas hose
Cause: O-ring on central connector has been cut or is faulty
Remedy: Replace O-ring
Cause: Moisture/condensation in the gas line
Remedy: Dry gas line
Cause: Gas flow is either too high or too low
Remedy: Correct gas flow
Cause: Insufficient gas flow at start or end of welding
Remedy: Increase gas pre-flow and gas post-flow
Cause: Rusty or poor quality wire electrode
Remedy: Use high-quality wire electrode with no impurities
Cause: For gas-cooled welding torches: gas is escaping through a non-insula-
ted inner liner
Remedy: Use only insulated inner liners with gas-cooled welding torches
Cause: Too much parting agent applied
Remedy: Remove excess parting agent/apply less parting agent
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