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17 Troubleshooting
Fault
Displays remain
dark
No welding cur-
rent
Arc does not
ignite
No inert gas
Too little inert gas Torch not tight
Pores in weld
metal
Seam "cooking"
(unsteady arc)
TIG electrode
melting
- 30 -
Possible cause
Defective mains fuse
Neutral conductor, mains phase
missing
Battery discharged
Ground line not connected or defec-
tive
Electrode holder or torch not con-
nected or defective
No or poor ground contact
Incorrect electrode diameter
Welding current set too low
Tungsten electrode soiled or incor-
rectly ground
Gas volume set incorrectly
Gas cylinder empty
Pressure reducer defective
Gas valve on torch not opened or
defective
Gas hose not tight
Pressure reducer set incorrectly or
defective
Torch not tight
Gas nozzle not tight
Torch head faulty
Workpiece soiled with grease, rust,
oil, etc.
Draught
Gas supply missing
Incorrect gas
Welding current set too high for
electrode diameter
Polarity reversed and TIG torch con-
nected to positive terminal 4
Replace the fuse
Check mains cable / mains extension
cable
Check and charge/replace battery
Check ground line and replace if neces-
sary
Check electrode holder or torch and
replace if necessary
Ensure ground contact
Select correct electrode diameter
Set welding current higher
Grind correctly or replace the electrode
if necessary
Set gas volume correctly
Replace gas cylinder
Check and replace if necessary
Check and replace if necessary
Check and replace if necessary
Tighten gas hose
Check and replace if necessary
Check and replace if necessary
Tighten gas nozzle
Check and replace if necessary
Clean it
Shield workplace
Check
Use correct gas
Set the correct welding current
Connect the TIG torch to the negative
terminal 3
909.2759.9-00
Troubleshooting
Rectification
02.16
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