Fronius MTG 270i Operating Instructions Manual page 50

Porosity of weld seam
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50
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