Weld seam porosity
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Spatter build-up in the gas nozzle causing inadequate gas-shielding
of the weld seam
Remove welding spatter
Either the protective gas shield hose has holes in it, or the hose is not
connected properly
Replace protective gas shield hose
The O-ring seals on the connection points have been cut through or
are faulty
Replace the O-ring seals
Moisture/condensation in the protective gas shield line
Dry protective gas shield line
Protective gas shield flow is either too high or too low
Correct the protective gas shield flow
Insufficient protective gas shield flow rate when welding starts or fi-
nishes
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: protective gas is escaping through a
non-insulated inner liner
Use only insulated inner liners with gas-cooled welding torches
Too much parting agent applied
Remove excess parting agent/apply less parting agent