42
A7 TIG Orbital System 150
© Kemppi Oy 2016
1615
OPERA
TING M
ANU
AL
6. TROUBLESHOOTING
6.1 Operation problems
Should you experience a malfunction from your machine, please consult the trouble-
shooting sections below first, and complete some basic checks.
If the machine malfunction cannot be corrected with these measures, contact your
Kemppi maintenance service workshop.
The problems listed and the possible causes are not definitive but serve to suggest
some standard and typical situations that may present during normal environmental use
when using the A7 TIG Orbital System 150.
Problem:
Check the following:
Machine won’t work
• Check that mains plug is connected correctly.
• Check that mains power distribution is switched on.
• Check the mains fuse and or circuit breaker.
• Check that power source 0/I switch is ON.
• Check that interconnection cable set and connectors
between the power source and weld head unit are
correctly fastened. See Installation section of this manual.
Dirty, poor quality weld
• Check shielding gas supply.
• Check and set gas flow rate.
• Check that correct welding program is selected.
• Check correct selection on the control panel.
Variable welding
performance
• Check welding parameter settings.
6.2 Tungsten electrode rotation not concentric to tube O.D.
The tungsten electrode should maintain an equal gap ±0.1mm (±0.005") Total Indicated
Runout (T.I.R.) as it rotates around the workpiece. Variations of arc gap outside this
tolerance will cause inconsistent penetration and weld bead width.
• Collets are sized to plus .075mm (.003”) over tube diameter to allow production
tolerance on tubing.
• Deviation of more than ± .05mm (.002”0) will cause tubing to be off-centre by
more than the allowed .1mm, which will result in an inconsistent penetration and
weld bead width.
• Collets should be specified to ± .5mm when ordered.
The "wheel base" of the collets determines how squarely the weld head clamps on the two
tubes and how much "squaring" capability it has.
• If two long runs of tube are not parallel and standard collets are being used, the
weld head cannot bring the two long lengths of tube into perfect alignment.
Therefore, there will be a run-out as the tungsten electrode rotates around the
tube ends.
• Correct this by using external alignment clamp or by using extended collets.