Fronius TTB 80 G Instructions De Service page 94

Porosity of weld seam
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Remedy:
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Poor ignition properties
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Gas nozzle is cracked
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94
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
Too much parting agent applied
Remove excess parting agent/apply less parting agent
Unsuitable tungsten electrode (e.g., WP electrode for DC welding)
Use suitable tungsten electrode
Wearing parts loose
Screw on wearing parts tightly
Tungsten electrode not protruding far enough out of the gas nozzle
Have tungsten electrode protrude more out of the gas nozzle