Fronius MTG 250d Instructions De Service page 54

Weld seam porosity
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54
Spatter build-up in the gas nozzle causing inadequate gas shield for weld
seam
Remove welding spatter
Holes in gas hose or hose is not connected properly
Replace gas hose
O-ring on central connector has been cut or is faulty
Replace O-ring
Moisture/condensation in the gas line
Dry gas line
Gas flow is either too high or too low
Correct gas flow
Insufficient gas flow at start or end of welding
Increase gas pre-flow and gas post-flow
Rusty or poor quality wire electrode
Use high-quality wire electrode with no impurities
For gas-cooled welding torches: gas is escaping through a non-insulated in-
ner liner
Use only insulated inner liners with gas-cooled welding torches
Too much parting agent applied
Remove excess parting agent/apply less parting agent