Fronius TTG 1200A Manual De Instrucciones página 52

Weld-seam porosity
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Poor ignition properties
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Cracks in gas nozzle
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52
Spatter accumulating in the gas nozzle, causing inadequate gas-shielding of
the weldseam
Remove the welding spatter
Either the shielding-gas hose has holes in it, or it is not connected up properly
Change the shielding gas-hose
The O-ring seals on the connection points are cut or defective
Change the O-ring seals
Moisture / condensate in the shielding-gas hose
Dry the shielding-gas hose
Shielding-gas flow is either too high or too low
Correct the shielding-gas flow
Insufficient shielding-gas flow at the beginning or end of welding
Increase the gas pre-flow or post-flow
Too much parting agent applied
Wipe off excess parting agent / apply less parting agent
Unsuitable tungsten electrode (e.g. WP electrode during DC welding)
Use suitable tungsten electrode
Loose wearing parts
Tighten the wearing parts
Tungsten electrode does not protrude far enough out of gas nozzle
Allow tungsten electrode to protrude further out of gas nozzle