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A7 TIG Orbital System 150
© Kemppi Oy 2016
1615
OPERA
TING M
ANU
AL
7.2.2 Cleaning the weld head
Clean the weld head periodically to maintain maximum
operating efficiency. Keep the unit free of moisture, debris,
and other contaminants (oil, water, abrasives, etc.) that can
affect normal operation and weld consistency.
• Clean insulating components with a soft brush
and a fast drying solvent, such as acetone or
denatured alcohol.
• Clean drive gear assemblies using a fine wire
brush and solvent. Inspect the drive gear, bevel
gear, and rotor assembly to insure that debris
have not damaged the rotor sprocket lobes and
affected the operation of the drive assembly. Use
a fine jeweler’s file to repair light.
• Clean the body with a cloth or soft brush and
solvent.
• Clean the collets with fine stainless steel wool or
fine wire brush.
Only use stainless steel, as regular carbon steel will ruin
the surface passivation. All parts must be completely dry
before reassembly.
Dirt and impurities in the weld head may cause internal
arcing. It is a situation where the arc jumps from the
tungsten electrode to the collet frame and the welding
arc fails to ignite.
7.2.3 Internal arcing
When internal arcing happens, a track of carbon is left on
the dielectric material, which may cause the same problem
to happen again.
To prevent internal arcing, do the following:
• Periodically clean the weld head according to
instructions given above in section “Cleaning the
weld head”.
• Maintain the tungsten electrode in good working
condition at all times.
Remember that the collet frame and collets are connected
to the ground cable and act as the ground contact for the
electrical circuit.
If internal arcing does occur, do the following:
• Carefully scrape all burn marks from the plastic
body with a razor blade or other sharp scraping
tool.
• Remove all carbon and polish with a fine wire
brush.
• Remove all carbon off the collet frame and collets
with a fine wire brush.
• Remove the rotor gear and polish if necessary
with a fine wire brush to remove any traces of
arcing.
• Clean with alcohol or other suitable solvent and a
lint free cloth before reassembling.