Small cavities or holes resulting from gas pockets in weld metal.
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5. TROUBLESHOOTING
5.2 Porosity
Possible Causes
Corrective Actions
Insufficient shielding gas at welding arc
Increase flow of shielding gas at
regulator/flowmeter and/or prevent drafts
near welding arc
Remove spatter from gun nozzle
Check gas hoses for leaks
Adjust nozzle distance from workpiece
Hold gun near bead at end of weld until
molten metal solidifies
Wrong gas
Use welding grade shielding gas, change to
different gas
Dirty welding wire
Use clean, dry welding wire
Eliminate pick up of oil or lubricant on
welding wire from feeder or liner
Workpiece dirty
Remove all grease, oil, moisture, rust paint
under coating, and dirt from surface, before
welding
Use a more highly deoxidizing welding wire
(contact supplier)
Welding wire extends too far out of nozzle
Do not extend wire too far beyond nozzle
