Rectifying faults
Checklist for rectifying faults
099-002025-EW501
29.11.2017
21
No arc ignition
Incorrect ignition type setting.
Setting the tungsten electrode
Regrind or replace the tungsten electrode
Ignition type: Select “HF start”. Depending on the machine, the setting is defined by the
changeover switch for ignition types or the
parameter in one of the machine menus (see the
“Control operating instructions”, if applicable).
Bad arc ignition
Material inclusions in the tungsten electrode due to contact with filler material or workpiece
Regrind or replace the tungsten electrode
Clean and change gas nozzle
Insufficient plasma gas quantity
Pilot arc current too low
Pilot arc ignites but no main arc forms
Distance between workpiece and torch too high
Decrease distance to workpiece
Contaminated workpiece surface
Bad current transfer on ignition
Check the setting on the "Tungsten electrode diameter/Ignition optimisation" rotary dial and
increase if necessary (higher ignition energy).
Setting 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)
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
Increased wear
Increased electrode wear
Plasma gas purity too low
Electrode distance too high
Insufficient water cooling
Gas supply leak
Shielding gas (argon) pre-/post-flow period too low
Increased nozzle wear
Electrode distance too high
Insufficient water cooling
Insufficient plasma gas quantity
Current limit exceeded
