Unstable arc
Material inclusions in the tungsten electrode due to contact with filler material or workpiece
Regrind or replace the tungsten electrode
Incompatible parameter settings
Check settings and correct if necessary
Pore formation
Inadequate or missing gas shielding
Check shielding gas setting and replace shielding gas cylinder if necessary
Shield welding site with protective screens (draughts affect the welding result)
Use gas lens for aluminium applications and high-alloy steels
Unsuitable or worn welding torch equipment
Check size of gas nozzle and replace if necessary
Condensation (hydrogen) in the gas tube
Purge hose package with gas or replace
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