ESAB Heliarc 161, Instruction Manual

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Unit dead, cooling fans not running, no power “ON”
light
Tungsten is blued and weld sooty & black
HF sparks between tungsten and work but no arc
transfer to workpiece.
Nothing happens when TIG torch switch is
pressed. No gas flows, no HF or power at the tung-
sten
Difficulty in initiating DC TIG arc
Tungsten melts and transfers to weld pool
Main fuse frequently blows
If all else fails
SECTION 5 TROUBLESHOOTING
Fault Remedy
Check front panel power switch is on. Check main
supply. Check main supply fuse
Check argon shielding gas supply is on and flow
is adequate
Check work lead is properly connected to a clean
location on the workpiece
Check the torch switch is properly connected at
the 14 pin socket. Check the switch and switch
wires.
Check a 2% thoriated,ceriated or lanthanated
tungsten is being used. Check for a good work
lead connection. Test machine in touch start mode
to confirm arc can be established. Regrind tung-
sten tip
Check TIG torch is connected to - (minus) output
socket. If AC TIG welding, reduce setting on bal-
ance control towards more negative polarity
(maximum penetration) or use a larger tungsten
Welding current level being used causes primary
current to exceed fuse rating. Use a larger fuse,
refer to specification section
Contact your ESAB distributor or an authorized
ESAB Service Center